Enable the Ansible task to optionally cleanup after itself.

Enable the Ansible task to optionally cleanup after itself.

If given the config value of ``cleanup`` the ansible task will rerun the
same playbook during the teardown stage with a ``teardown`` var added
with a value of True.  This will allow the playbook to cleanup after
itself during teardown, if the playbook supports this feature.

Signed-off-by: Andrew Schoen <aschoen@redhat.com>