update keystoneauth1 to 3.15.0
update keystoneauth1 to 3.15.0

Without that version update we get this:

  14006 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/keystoneauth1/session.py", line 835, in request
  14006 ERROR oslo_messaging.rpc.server     resp = send(**kwargs)
  14006 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/keystoneauth1/session.py", line 926, in _send_request
  14006 ERROR oslo_messaging.rpc.server     resp = self.session.request(method, url, **kwargs)
  14006 ERROR oslo_messaging.rpc.server TypeError: request() got an unexpected keyword argument 'global_request_id'

Change-Id: I65ae69588c6bf5f80a3a91e631300ff168a3b749

openstack/rpm-packaging,openstack/rpm-packaging