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For compliance with the Project Testing Interface [1] as described in [2] [1] https://governance.openstack.org/tc/reference/project-testing-interface.html [2] http://lists.openstack.org/pipermail/openstack-dev/2017-December/125710.html doc8 command is dropped from docs tox envs. So this affect nothing and run in PEP8. Related-Bug: #1765348 Depends-On: Icc7fe3a8f9716281de88825e9d5b2fd84de3d00a Change-Id: Idf9a16111479ccc64004eac9508da575822a3df5