TripleO recently concluded the migration to the new ceph deployment
tool (cephadm). The ceph-ansible.yaml environment file, however, is
still relevant in an upgrade context, where ceph-ansible rolling
update playbook is executed.
For this reason, this patch introduces a new validation to make sure
this environment file and the related registry resources can be used
during the update/upgrade context but not when a regular overcloud
deploy or stack updates are executed.
Change-Id: Iec23801a9eec1830469a53ab5ffc641125b5d3ff