Run designate pool update only on bootstrap node
Run designate pool update only on bootstrap node

If this is run on all nodes it can cause collisions while updating
the database.

Change-Id: I1dcb28aac111189eec142c6b4c8879431f72094b

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