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.




[This space left intentionally blank to allow for the insertion of an Alanis Morisett joke.]



Is there a strong reason to use a continuation character here, instead of just listing the arguments out like many other tasks? If the arguments get too long, a carriage return and indentation to the correct level is allowed. No continuation character needed.