Updated openstack/openstack
Project: openstack/python-ceilometerclient  2f6eb4308cf0db0eba7d82627dcae58ae704d122

Add docs job to tox.ini

This will allow developers to more easily run the docs job that
generates the developerdocs for python-ceilometerclient

Change-Id: I27bb80e476d4bef85d3a543d7b4738ec6c29b6db