Issue: Should MOBIKE react to problems not known locally (#NEW)

Should MOBIKE only react to problems that are known
to the nodes locally? For instance, if an interface
in a host goes down, or it is assigned a new address,
then the node knows about this and can tell its peer.

Or should MOBIKE also deal with other problems, typically
based on the symptom of not getting packets through?
For instance, should MOBIKE attempt to do a failover
upon seeing

- DPD failure
- ICMP error
- No response to the MOBIKE protocol messages
- No incoming payload packets