Comment 6 for bug 1764556

I think we could get into the bad state described in the bug if we do a slightly different series of actions:

1) boot instance on Ocata
2) migrate instance
3) delete compute node (thus deleting the service record)
4) create compute node with same name
5) migrate instance to newly-created compute node
6) upgrade to Pike

This should result in the deleted service not having a UUID, which will cause problems in Pike if we do a "nova list".

I suppose an argument could be made that this is an unlikely scenario, which is probably true. :)