Comment 2 for bug 1509077

It seems like this bug could occur if you upgrade MAAS, and then try to redeploy a node without recommissioning first. More specifically, if the node has a static IP address assigned, and we never updated its subnet to link to the appropriate one, we'll hit this bug.

A possible fix is to change _claim_auto_ip() so that it attempts to locate the proper subnet (if the IP address does not have an associated subnet).