Updated openstack/openstack
Project: openstack/python-openstackclient  ddcc66839372506f607d8f65b9a085b181291f2b

Add a docs job to tox.ini

A noticed that there wasn't a docs option when running tox.
Thought it would be a good idea to add one.

Partial-Bug: #1331304
Change-Id: I5af9ff5d5986ad546146c0fa73eb98256fd00c5f