Downgrade old EOL releases, give current maintained releases and
development versions a higher priority.
this needs changes to the test framework, update mocking. Also, rename
URL to be docs.openstack.org and not .com.
- add py3 to tox.ini (gate already tests py3)
- move all tests to $GITROOT/test so they can all run
- add scrapy to test-requirements.txt to support sitemap tests
- move tests from test_items.py to test_sitemap_file.py
- fix broken sitemap tests
- add newton to list of old releases in sitemap_file.py
- ignore flake8 H101 as it returns false positives for Sphinx conf.py
- Use openstackdocstheme for docs
- Update sitemap README
- Restructure repo docs
- fix minor style issues