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.]



How about using the synchronize module here?

    synchronize: src={{ ironic.path }}/etc/ironic/rootwrap.d dest=/etc/ironic
    delegate_to: inventory_hostname