Accomodate premium cartridges and associated oo-a-y-v roles

Examine cartridges_to_install for premium cartridges that require additional
oo-a-y-v node roles.

Remove openshift_origin::role from init.pp as items called from roles may rely
on variable evaluation. As far as I can tell this was un-necessary anyway as
we're inheriting role in all of our roles anyway.