Updated openstack/openstack
Project: openstack/python-ceilometerclient  2d4c6446ff6985c3eb9c4742df1c8d0682dee6ea

Add CONTRIBUTING.rst

There is no CONTRIBUTING.rst file, the patch will add it.

Change-Id: I979aca09917f20991ccdc7d4c5d1612fcd1f24c0