ReNo [1] is the release management tool in OpenStack.
This patch adds the basic structure to start using it.
* Update .gitignore
* Add a basic note "use-reno"
* Add releasenotes/ dir and basic files
* Add python files: setup.cfg, setup.py, test-requirements.txt and
tox.ini.
[1] http://docs.openstack.org/developer/reno
Change-Id: I77f0375f185053425906ee52f6ad3bc83c7dd24d
