Updated openstack/openstack
Project: openstack/keystone  6f742d8fb8adf977b3e02c77b6f6953e2dcd2931

Update references to auth_token middleware.

The auth_token middleware has been in keystonemiddleware for a
while now.

Change-Id: I7a355f0af84334430285e8fd887ae014f1d1f21e