Updated openstack/openstack
Project: openstack/keystone  a7f104bcb8137ba81c5c6f50a53de65bba106c1d
null
Enhance tests for assignment create_grant when no user or group

There were no tests that show the behavior of create_grant when
the user or group doesn't exist. Turns out the behavior is
different depending on the backend (sql vs kvs vs ldap).

Change-Id: I71c3e2b94aaa44e40c8a891b49cc2a9961cee16f
Related-Bug: #1239476