Allow nic-config conversion without Heat
Allow nic-config conversion without Heat

The current script requires the orchestration (Heat)
be available. This change will allow the script to convert
existing templates provided without the orchestration
service present.

Change-Id: Ie94de5841617cd8dc87ee7dccc5d4ece5b908cb9

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