Updated openstack/openstack
Project: openstack/nova  946570d758e5052bc933b2ffd643dc8d08e6bf38

Use py27 version of assertRaisesRegexp

Now that we don't support py26 we can use the built in
assertRaisesRegexp (which takes slightly different parameters).

Change-Id: Icf30a75f353809984bafb202781120d16979f670