Since Ansible 2.5, the use of jinja tests as filters has been deprecated.
I've run the script provided by the ansible team to 'fix' the jinja filters
to conform to the newer syntax.
This fixes the deprecation warnings.
Change-Id: I775c849c944f82bdfc779c8c530346e7ebedbd2a
Having tagged plays allows us to easily run a subset of the plays for a
command, and perform targeted operations with less risk of unintended
consequences.
The tags are typically named after the playbook, although some of the
overcloud playbooks have been tagged without an overcloud- prefix.