Remove unused class variables from token provider
Remove unused class variables from token provider

These two were just chillin' as token provider class variables. They
are not used anywhere and we use special notification strings defined
in notification.py for good reason. Keeping things defined in one
place makes maintenance easier. Remove the unused variabels from the
token provider.

Change-Id: I98f29114daa01df94f12813143da9097c294b43a

openstack/keystone,openstack/keystone,openstack/keystone,mahak/keystone,mahak/keystone,mahak/keystone