This repo is now testing only with Python 3, so let's make a few cleanups: - Remove obsolete sections from setup.cfg - Update requirements, no need for python_version anymore - Use newer openstackdocstheme and Sphinx versions - Remove install_command from tox.ini, the default is fine Change-Id: I43c3b5653289753da4fb1d2b6db5b03336b42d67changes/94/721094/2