We will definitely need this in the mid-term to work out the ironic use case, but for now let's use this as a second virt in labtestn.
This means:
- Change partman recipe to something compatible
- Reinstall as debian jessie (use scripts on neodymium.eqiad.wmnet)
- apply role (labtestn nova compute should be applied already so it's just making sure it all applies cleanly)