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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Since the two calls above are the same thing, just with different package names, could they have been squished into one task, extending the items in the first task?