instance dns: allow the instance nameserver to be overridden

Change-Id: I56fd6ced92f3d1972c06189f708f557453cdd935
logs: collect logs should be in its own playbook

If the packstack or foreman playbook fails and collect
logs is in the same playbook, logs will not be collected.
Moving it out, w/ provision tag.  If the box is provisioned
we should have logs of it.

Change-Id: I7586394030fdfce333443fdccb73b44e39069b0a
adding a jinja template for fedora rdo

Removing the old way of installing an rdo-release for stage.
Adding the rdo repo directly for fedora is the supported flow.

Change-Id: I5ecfe8b969c78785403261df730c843030d09aa6