ReNo [1] is the release management tool in OpenStack.
This patch adds the basic structure to start using it.
* Update .gitignore
* 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: Ibc3bddbc6af65074a4841b4a50043547a76fd26b