branch 'dk-mock-improvements' rebased onto develop

hive/conf.py

hive/indexer/blocks.py

hive/indexer/mock_block_provider.py

hive/indexer/mock_data_provider.py

hive/indexer/mock_vops_provider.py

hive/indexer/sync.py

hive/server/hive_api/community.py

hive/steem/block/schedule.py

hive/steem/block/stream.py

hive/steem/client.py

mock_data/block_data/follow_op/mock_block_data_follow.json

...a/block_data/vops_tests/mock_block_data_vops_prepare.json

mock_data/examples/vops_data/mock_vops_data_example_003.json

..._data/vops_data/vops_tests/mock_vops_data_vops_tests.json

scripts/ci/hive-sync.sh

scripts/ci_sync.sh

tests/tests_api