Updated openstack/openstack
Project: openstack/keystone  890f8139aa279666173fe363469a5f73a80be13a
null
token provider cleanup

UUID and PKI tokens are peers, and PKI should not be a subclass of
UUID.  This is the start of a cleanup effort to break the Provider
into a pipeline, but done in a way that each change is understandable
on its own.

Change-Id: I0720695b91d20a675374e713fe9ac6c0d7120484