Code review comment for lp:~cbehrens/nova/lp844160-build-works-with-zones

Vish:

[...]
> I wrote some code long ago in my branches to get rid of using the db to pass
> information back and forth that handled this. It even managed the conversion
> back on updates:
[...]
> I was able to pass entire refs through the queue using this and update them on
> the other end.

Very cool. I'll probably look at incorporating this as a next step. This diff is already large enough due to moving code around. There are a lot more areas where we should be doing this, and it's a point of discussion that blamar suggested for the summit, also.