Comment 2 for bug 1057471

Agreed. We should also consider what to do when there's an error during a reconfiguration while zuul is running. We could either remember the old state and keep using it, or exit. Remembering the old state will take a good chunk of extra code, but would be best. Exiting is slightly better than what we have now (keep running while broken). So I think either of those are acceptable solutions, with the first being the preferable long-term goal.