Freeze Break Request: Enabling Nested Virt for Production Taskotron Virthosts

This is less important than the other FBR that I submitted but I'd like to do it while things are paused for the other change. I'd like to enable nested virt on the virthosts that run the Taskotron production clients. What I'd be doing is: - adding the 'virthost' role in ansible - running the playbook for the Taskotron client virthosts - rebooting the machines (qa12.qa and qa13.qa) The change is small and since jobs are already stopped, there should be little impact other than nagios warnings if I forget to schedule downtime :) If something goes wrong, we can remove the nested virt enablement and reboot the hosts again. If all else fails, we can sub in the dev and stg virthosts because all of the Taskotron virthosts are pretty much identical. I think that this is incredibly unlikely, though. +1s? Tim