Updated openstack/openstack
Project: openstack/nova  27b03dbd9f67720c388e1fdea5177f068988b6c8

move all conf overrides to conf_fixture

Some config overrides were in conf_fixture, and some were living in
test.py:setUp. If we are globally overriding conf variables we should
do it in one place, the fixture.

Change-Id: Ief66e2245179a37eae60bafaf9e8f452d89319a7