Add the certificate specs in ceph_grafana composable service
Add the certificate specs in ceph_grafana composable service

In order to meet the tls cert request requirements, this
change adds the tht config and metadata settings.

Change-Id: Id62150e6e8fddb320ffb8ef94d33b03ed16c9ee6

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