Enable panko service by default on overcloud
Enable panko service by default on overcloud

There are other applications still relying on panko and not
enabling by default is causing integration concerns.

Closes-bug: #1666619

Change-Id: I615694ca5f5a04fef4b0098c8083fb43432bb81f

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