Auto 382 worker retries delete (ready for review)

Worker, instead of verifying the delete, just retries the delete over and over again.  Unfortunately this adds to the deploy time, since a job in theory could take up to 2 hours.  This is probably unlikely though, unless Nova is REALLY broken (since once the server is out of building, nova should delete the server after a couple of calls).

Note:  this is the simplest thing I can think of, but perhaps we want to actually just terminate once it's in DELETING state, rather than getting a 404.