Muawia Khan bd39076522 Problem: Users trying to use an incompatible version of Tendermint (#2541)
-  Hard-wire the supported Tendermint version(s) right in the code of BigchainDB Server. Check the version of Tendermint and disconnect if Tendermint version is an unsupported one.
- Expose a CLI command bigchaindb tendermint-version to display the supported Tendermint versions.
- PR also takes care the long list of warnings we get when we run tests.
    - Updated deprecated pymongo methods
    - Do not call pytest fixtures directly.
    - Also added the doc for the new cli command
2018-09-14 15:37:18 +02:00
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