This repo is now testing only with Python 3, so let's make
a few cleanups:
- Remove python 2.7 stanza from setup.py
- Remove obsolete sections from setup.cfg
- Update classifiers
- Cleanup doc/source/conf.py to remove now obsolete content.
- Use newer openstackdocstheme version
- Remove install_command from tox.ini, the default is fine
- Remove unneeded test-requirements.txt file
- Use basepython=python3 for testenv, remove it elsewhere
Currently the CI is broken because of Sphinx 1.6.1.
We should really start using global-requirements properly.
Purged requirements, as this is not a Python project.
Note that sphinx_rtd_theme is not in g-r, it was kept as it is.