- Add make_oslosphinx_optional.patch
https://review.openstack.org/#/c/443555/

- Update to pbr-2.0.0
* tox: Don't set skipsdist=True
* Stop using 'warnerrors'
* doc: Clarify sections in 'setup.cfg'
* Updated from global requirements
* Remove discover from test-requirements
* Add Constraints support
* Don't raise exception on missing man pages
* Updated from global requirements
* Clean imports in code
* Updated from global requirements
* Docstrings should not start with a space
* Changed the home-page link
* Update .coveragerc after the removal of openstack directory
* coverage package name option, doc improvement
* Updated from global requirements
* Deprecated warning for SafeConfigParser
* Add more words to a confusing error message
* Don't ignore data-files
* Change assertTrue(isinstance()) by optimal assert
* Fix handling of old git log output
* Fix typo in the index.rst
* Expose deb version to match exposing rpm version
* Replace OpenStack LLC with OpenStack Foundation
* Updated from global requirements
* Fix pypy soabi tests
* Add Python 3.5 classifier and venv