Add DeployIdentifier to Nova discover hosts container
Add DeployIdentifier to Nova discover hosts container

Resolves an issue during scale out where the Nova init
container that runs discover hosts wasn't executing on a Heat
stack update if the container name and configs all stayed the same.

Change-Id: Ie2ecd3dbddb1cf3ee5bba6f7b33e11bc9b6b8b4e
Closes-bug: 1733966

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