Configure Heat engine metadata URL's
Configure Heat engine metadata URL's

Tried to use the heat-engine composable service in the Undercloud and I
discovered that my software deployments (when spinning up an overcloud)
weren't getting signals from my t-h-t configured undercloud heat.
This patch resolves the issues by configuring the metadata URLs
for Heat.

Change-Id: I57c9e7010bfe4afc6e62fb4c3406716d11cdfa28
Closes-bug: #1653985

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