Updated openstack/openstack
Project: openstack/pycadf  a78885ce19bf07268400267807ca94edbe88f859

Remove dependencies from docs test env in tox.ini

Because the docs environment inherits from the greater 'testenv', which
has the dependencies already mentioned, there is no need to
have them listed again for the 'docs' environment.

Change-Id: I83830e47b44cab2a9d44a67827f3f28b687c5fdd