add keystonemiddleware to keystone projects

This is in support of bp split-middleware

  https://blueprints.launchpad.net/keystone/+spec/split-middleware

Which is specified here:

  https://github.com/openstack/keystone-specs/blob/master/specs/keystonemiddleware/split-middleware-repo.rst

Change-Id: Ie518d4a828e1ebc1799efa9fb8f8ce30c770e879
Merge "add keystonemiddleware to keystone projects"