Fix baremetal role idempotency
Fix baremetal role idempotency

When you add new nodes to existing cluster, docker will restart
all anyway and that will break a lot, including mariadb.

Change-Id: Ie46f99a141f99480a87218ead4b76ba65f2edae9
Closes-Bug: #1699335

dardelean/kolla-ansible,dardelean/kolla-ansible,dardelean/kolla-ansible