Updated openstack/openstack
Project: openstack/keystone  28c13360a77b0ec7e4f3564bbfdae7ef1b403359
null
Remove auth_token middleware doc

The auth_token middleware is in python-keystoneclient now so the
docs for it should be there.

Change-Id: I9811b648e92e16b099764f40aa67dd084f445088