Don't use keystone admin endpoint for nova placement
Don't use keystone admin endpoint for nova placement

We're trying to move away from using keystone's admin endpoint. This
uses the internal one instead.

Change-Id: I9aabf0ac8f1fb21f835937fa4354cad3c8443211

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