Updated openstack/openstack
Project: openstack/keystone  4c5e1e704b4eccdb1dd0c4c2c2ee643495456443

Document Keystone2Keystone federation

Document the following:
  - create a region
  - setup config options
  - run keystone-manage command for metadata
  - samlize the token

Change-Id: I771fc5bbe1bb57f36bfbc929f2c64d17c2641899