Placement: Use consistent endpoint url
Placement: Use consistent endpoint url

This is a prep work to update default port/path used when placement
api is hosted by httpd+wsgi, to make placement endpoint urls consistent
with the other services.

Change-Id: I629e48ba234b9e966d6b2d2813dd51441b5befc1

openstack/puppet-openstack-integration,openstack/puppet-openstack-integration,openstack/puppet-openstack-integration