Updated openstack/openstack
Project: openstack/keystone  0ed6d48445245cf658b7e6f6f5bd72b1d4184720
null
Mock sys.exit in testing

If exit is called during subunit then it exits the subunit process which
makes the test suite fail with no information.

Change-Id: I7c189fad05f0d38c35e4014ff414d91841bc7632
Closes-Bug: #1276885