Added tests for `get_discussions_by_feed` group, when reblogs are taken

hivemind/tavern/condenser_api_patterns/get_discussions_by_feed/bartcant.orig.json

+Check `readme.txt` first
+
+post_id  author           permlink                                                                                        
+-------  ---------------  ------------------------------------------------------------------------------------------------
+
+
+
+The result is empty, because the account `jamesc` hasn't any reblog. The clause `HAVING` excludes whole result,
+because doesn't exist any feed for any followings and for ["gavvet","telescopic-tour-featuring-luision-as-author"].

hivemind/tavern/condenser_api_patterns/get_discussions_by_feed/bartcant.tavern.yaml

+---
+  test_name: Hivemind condenser_api.get_discussions_by_feed patterns test
+
+  marks:
+    - patterntest # tag is not a tag but account whose feed we are looking at (set of posts created/reblogged by those followed by selected account)
+                  # there can be no nonempty results for not-up-to-date HM because it only gives posts that were created/reblogged within last month (no param to change it)
+                  # there are 4 reblogs done by 'jamesc` account
+  includes:
+    - !include ../../common.yaml
+
+  stages:
+    - name: get_discussions_by_feed
+      request:
+        url: "{service.proto:s}://{service.server:s}:{service.port}/"
+        method: POST
+        headers:
+          content-type: application/json
+        json:
+          jsonrpc: "2.0"
+          id: 1
+          method: "condenser_api.get_discussions_by_feed"
+          params: {"tag":"bartcant","start_author":"churdtzu","start_permlink":"impossible-a-conversation-with-a-statist-about-starting-a-business","limit":20}
+      response:
+        status_code: 200
+        verify_response_with:
+          function: validate_response:compare_response_with_pattern
+          extra_kwargs:
+            method: "bartcant"
+            directory: "condenser_api_patterns/get_discussions_by_feed"
\ No newline at end of file

hivemind/tavern/condenser_api_patterns/get_discussions_by_feed/funthing.orig.json

+Check `readme.txt` first
+
+post_id  author         permlink                                                                                            
+-------  -------------  ----------------------------------------------------------------------------------------------------
+ 834376  gavvet         telescopic-tour-featuring-luision-as-author                                                         
+ 823675  gavvet         chronicles-of-alan-army-day-s-final                                                                 
+ 823386  gavvet         selfie-with-the-partial-solar-eclipse-featuring-tim-beck-as-author                                  
+ 815301  berniesanders  please-stop-sending-sbd-asking-me-to-look-at-your-links                                             
+ 814031  gavvet         re-evaluating-the-star-of-bethlehem-part-1-featuring-new-author-vuyusile                            
+ 811048  gavvet         the-state-of-steemit-com-growth                                                                     
+ 802704  ratel          what-is-smart-lens                                                                                  
+ 799582  gavvet         maybe-my-daughter-just-doesn-t-like-me-featuring-hanshotfirst-as-author                             
+ 788913  gavvet         anger-a-self-administered-poison                                                                    
+ 788251  gavvet         chronicles-of-alan-another-reason-i-do-not-drink-featuring-awgbibb-as-author                        
+ 787754  gavvet         journey-to-the-tolbachik-the-story-with-original-pictures-part-1-puteshestvie-na-tolbachik-featuring
+ 779009  ratel          kak-ya-stal-zhertvoi-moshennikov-dvazhdy-za-den                                                     
+ 765614  btcturbo       pazl-wings-seriya-3-kak-rabotayut-zayavki-na-sozdanie-dao                                           
+ 765193  gavvet         fire-walking-i-ve-done-it                                                                           
+ 764951  gavvet         knights-of-the-sea-greates-battleships-of-ww-ii-rycari-morya-linkory-vtoroi-mirovoi-featuring-burmik
+ 757009  gavvet         lyrics-from-alan-stalker-featuring-awgbibb-as-author                                                
+ 756589  gavvet         the-life-of-an-ambivert-featuring-sauravrungta-as-author                                            
+ 744234  gavvet         steel-birds-the-main-planes-fighters-of-ww-ii-part-ii-eng-rus-featuring-burmik123-as-author         
+ 743882  gavvet         i-think-you-re-crazy-for-making-me-write-an-essay-telling-you-who-i-think-i-am-featuring-author-john
+ 733930  gavvet         i-always-had-a-fantasy-of-being-a-chef-jeg-har-alltid-hatt-en-fantasi-om-a-vaere-en-kokk-featuring-n
+
+
+Following records don't exist in pattern.
+[`gavvet`, `i-think-you-re-crazy-for-making-me-write-an-essay-telling-you-who-i-think-i-am-featuring-author-john`]
+[`gavvet`, `i-always-had-a-fantasy-of-being-a-chef-jeg-har-alltid-hatt-en-fantasi-om-a-vaere-en-kokk-featuring-n`]
+
+It's caused by lack of reblog for the account `jamesc`, therefore instead of above records, there are following records in pattern 
+[`charleshosk`, 'my-thoughts-on-ross`]
+[`dantheman`, `why-do-we-fight-to-change-the-world`]

hivemind/tavern/condenser_api_patterns/get_discussions_by_feed/funthing.tavern.yaml

+---
+  test_name: Hivemind condenser_api.get_discussions_by_feed patterns test
+
+  marks:
+    - patterntest # tag is not a tag but account whose feed we are looking at (set of posts created/reblogged by those followed by selected account)
+                  # there can be no nonempty results for not-up-to-date HM because it only gives posts that were created/reblogged within last month (no param to change it)
+                  # there are 2 reblogs done by 'jamesc` account
+  includes:
+    - !include ../../common.yaml
+
+  stages:
+    - name: get_discussions_by_feed
+      request:
+        url: "{service.proto:s}://{service.server:s}:{service.port}/"
+        method: POST
+        headers:
+          content-type: application/json
+        json:
+          jsonrpc: "2.0"
+          id: 1
+          method: "condenser_api.get_discussions_by_feed"
+          params: {"tag":"funthing","start_author":"gavvet","start_permlink":"telescopic-tour-featuring-luision-as-author","limit":20}
+      response:
+        status_code: 200
+        verify_response_with:
+          function: validate_response:compare_response_with_pattern
+          extra_kwargs:
+            method: "funthing"
+            directory: "condenser_api_patterns/get_discussions_by_feed"
\ No newline at end of file

hivemind/tavern/condenser_api_patterns/get_discussions_by_feed/roadscape.orig.json

+Check `readme.txt` first
+
+post_id  author          permlink                                                                                            
+-------  --------------  ----------------------------------------------------------------------------------------------------
+ 816377  the-alien       we-have-competition-so-what                                                                         
+ 816010  hilarski        social-media-tip-4-quality-plus-consistency-for-success                                             
+ 815582  timsaid         the-steemit-crypto-challenge-4                                                                      
+ 815451  blueorgy        magic-eye-challenge-002-riddle-me-this                                                              
+ 815359  dana-edwards    z-cash-is-it-possible-to-be-too-anonymous-new-truly-anonymous-cryptocurrency-z-cash-is-about-to-have
+ 815222  dwinblood       gamedev-007-so-the-game-was-greenlit-what-have-we-been-up-to-since-then-wormhole-ventures           
+ 814971  thecryptofiend  things-i-wish-i-d-known-when-i-was-18                                                               
+ 814792  phenom          the-internet-of-things-our-better-future                                                            
+ 814307  sean-king       reading-the-bible-is-like-picking-out-diamonds-from-dunghills-part-2                                
+ 814300  stephthegeek    i-was-picking-up-something-from-my-storage-room                                                     
+ 814210  dwinblood       have-any-of-you-recently-used-steemshovel-com-it-works-much-better-i-found-some-things-i-missed-befo
+ 814200  tuck-fheman     steemocracy-a-steem-comic-or-volume-12-or-stellaaaaa-and-the-viking                                 
+ 814142  reneenouveau    protect-yourself-because-no-one-else-is-going-to-blockchains-versus-palimpsests                     
+ 814096  sean-king       reading-the-bible-is-like-picking-out-diamonds-from-dunghills                                       
+ 813961  mikemacintire   you-can-see-my-reflection-in-this-iguana-s-eye                                                      
+ 813729  blueorgy        the-upvote-multiplier-more-curation-power-at-the-cost-of-voting-power-ui-design                     
+ 813500  nexusdev        dapp-a-day-18-erc20-token-vault                                                                     
+ 813330  reneenouveau    wilder-ranch-coastal-archaeology-and-seals                                                          
+ 813079  blakemiles84    blake-s-mix-1015-porter-robinson-and-mat-zp-easy                                                    
+ 812987  timelapse       colors-of-agra                                                                                      
+
+Following records don't exist in pattern.
+[`blakemiles84`, `blake-s-mix-1015-porter-robinson-and-mat-zp-easy`]
+[`timelapse`, `colors-of-agra`]
+
+It's caused by lack of correct reblogs for the account `test-safari`, therefore instead of above records, there are following records in pattern 
+[`charlieshrem`, 'a-geek-in-prison-a-life-series-by-charlie-shrem-part-3-i-m-actually-in-prison`]
+[`rossulbricht`, `lyn-ulbricht-mother-of-silk-road-political-prisoner-ross-ulbricht-is-now-on-steemit`]

hivemind/tavern/condenser_api_patterns/get_discussions_by_feed/roadscape.tavern.yaml

+---
+  test_name: Hivemind condenser_api.get_discussions_by_feed patterns test
+
+  marks:
+    - patterntest # tag is not a tag but account whose feed we are looking at (set of posts created/reblogged by those followed by selected account)
+                  # there can be no nonempty results for not-up-to-date HM because it only gives posts that were created/reblogged within last month (no param to change it)
+                  # there are 2 reblogs done by 'test-safari` account
+
+  includes:
+    - !include ../../common.yaml
+
+  stages:
+    - name: get_discussions_by_feed
+      request:
+        url: "{service.proto:s}://{service.server:s}:{service.port}/"
+        method: POST
+        headers:
+          content-type: application/json
+        json:
+          jsonrpc: "2.0"
+          id: 1
+          method: "condenser_api.get_discussions_by_feed"
+          params: {"tag":"roadscape","start_author":"the-alien","start_permlink":"we-have-competition-so-what","limit":20}
+      response:
+        status_code: 200
+        verify_response_with:
+          function: validate_response:compare_response_with_pattern
+          extra_kwargs:
+            method: "roadscape"
+            directory: "condenser_api_patterns/get_discussions_by_feed"
\ No newline at end of file

hivemind/tavern/condenser_api_patterns/get_discussions_by_feed/val-a.orig.json

+Check `readme.txt` first
+
+post_id  author           permlink                                                                                        
+-------  ---------------  ------------------------------------------------------------------------------------------------
+
+
+
+The result is empty, because the account `jamesc` hasn't any reblog. The result for `val-a` account consist of 5 records and every record is a reblog.

hivemind/tavern/condenser_api_patterns/get_discussions_by_feed/val-a.tavern.yaml

+---
+  test_name: Hivemind condenser_api.get_discussions_by_feed patterns test
+
+  marks:
+    - patterntest # tag is not a tag but account whose feed we are looking at (set of posts created/reblogged by those followed by selected account)
+                  # there can be no nonempty results for not-up-to-date HM because it only gives posts that were created/reblogged within last month (no param to change it)
+                  # there are 5 reblogs done by 'jamesc` account
+
+  includes:
+    - !include ../../common.yaml
+
+  stages:
+    - name: get_discussions_by_feed
+      request:
+        url: "{service.proto:s}://{service.server:s}:{service.port}/"
+        method: POST
+        headers:
+          content-type: application/json
+        json:
+          jsonrpc: "2.0"
+          id: 1
+          method: "condenser_api.get_discussions_by_feed"
+          params: {"tag":"val-a","start_author":"","start_permlink":"","limit":10}
+      response:
+        status_code: 200
+        verify_response_with:
+          function: validate_response:compare_response_with_pattern
+          extra_kwargs:
+            method: "val-a"
+            directory: "condenser_api_patterns/get_discussions_by_feed"
\ No newline at end of file