Ussuri Communtiy-wide goal:
https://governance.openstack.org/tc/goals/selected/ussuri/drop-py27.html
Include small cleanups:
* remove install_command from tox.ini, this is the default
* Use sphinx-build as modern way to run sphinx, remove setup.cfg
settings for build-sphinx
* Use sphinxcontrib-apidoc for docs with newer sphinx
* Remove obsolete doc/source/conf.py broken
* Add python-requires to setup.cfg to make Python 3.6 requirement
explicit
* Remove obsolete pbr setup-hooks
Co-Authored-By: Andreas Jaeger <aj@suse.com>
Change-Id: Iec8c47b82022b616b8361651bf23f853b0ce5624
939253044a