placement: switch service to use NovaPlacementNetwork
placement: switch service to use NovaPlacementNetwork

... instead of using NovaApiNetwork.

Change-Id: I34043c68c24b05bac98f864bc2ac2fc4743617ab

openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates