Comment 5 for bug 1479181

Since cells is considered experimental and is not a typical deployment this doesn't quite meet the criteria for critical.

Also, it's possible that it's not documented anywhere but we have never made guarantees about the backwards compatibility of nova-cells. It's always been assumed that they will be upgraded in lockstep. Having said that, I think there is value in putting the patches up to help others who may run into this while trying to do something that's technically unsupported.