Set of tests for hivemind using tavern library

There are two types of tests included:

• test_*_patterns.tavern.yaml - contains test definitions and patterns to compare with (response is validated versus data saved in pattern file). Patterns are taken from 5mln pyrest test directory,
• test_*_smoketest.tavern.yaml - contains test definitions to check if given api is working (response is checked only for existence).

For more detail please take a look into provided README.md

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• b1488be6 - Hivemind address and port are now read from env variable

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• ef779872 - Removed redundant tests

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merged

mentioned in commit ac5cf025