Enable TLS configuration for containerized Galera

Enable TLS configuration for containerized Galera

In non-containerized deployments, Galera can be configured to use TLS
for gcomm group communication when enable_internal_tls is set to true.

Fix the metadata service definition and update the Kolla configuration
to make gcomm use TLS in containers, if configured.

bp tls-via-certmonger-containers

Change-Id: Ibead27be81910f946d64b8e5421bcc41210d7430
Co-Authored-By: Juan Antonio Osorio Robles <jaosorior@redhat.com>
Closes-Bug: #1708135
Depends-On: If845baa7b0a437c28148c817b7f94d540ca15814