The keystone federation documentation says to use the 'mapped' method
instead of the 'saml2' method[1]. However, that entrypoint was never
added, so trying to use it resulted in keystone not being able to load
its wsgi scripts and failing. This patch adds the entrypoint so that
keystone won't explode.
[1] http://docs.openstack.org/developer/keystone/federation/federated_identity.html#configuring-federation-in-keystone
Change-Id: I6dd8c219765728ecf01b50f35c3c0da3943f13b0
fd2a4fa07e