Initial support for Openstack Ironic

* Increased complexity of db sync tasks to utilize alembic for db
   migrate.
* Ironic feature flags/tags ( ironic.enabled/ironic ).
* Seperate roles for common and control.
* Had to go into virtualenv as it caused issues with the shared python libs.




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I just liked the idea of having seperate sections for pre-reqs vs the app itself.   if you think it makes more sense to squish them into the same task i can.