This change breaks out the Placement service from Nova ahead of it's
removal from the project later in Stein.
For the time being the original Nova Placement images are left in place
but they will be removed later in the cycle once the Placement code is
removed from the Nova project by the following change:
https://review.openstack.org/#/c/618215/
Co-Authored-By: Lee Yarwood <lyarwood@redhat.com>
Change-Id: I2bf6f5bf45b76e6900f41c21e9af30c69dc6e9c0
2f657085c6