Updated openstack/openstack
Project: openstack/nova  956e8e726bdde200b7b54598187910d080dc5913

do not use unittest.TestCase for tests

We setup a number of fixtures in nova.test that are part of our
expected runtime, including stdout / stderr capture. Fix a recently
committed unit test that was bypassing that.

Change-Id: Ia6c02f8dff7d910353121c51fe1ec97d0454809d