Updated openstack/openstack
Project: openstack/keystone  7ad7451c3e6cd5feb5acb592fcbc168d9582f1a5

Remove fixture from openstack-common.conf

Keystone doesn't use anything in fixture, so remove it from
openstack-common.conf and re-sync with oslo-incubator 5fa2da to
remove unused parts.

Change-Id: Icec01fc7e3bcf3df03c1f8a589d13f8955c64380