NLM lock failover = statd enablement

This kernel patch has *not* been tested out yet and it needs to be
paired with user mode nfs-utils changes (not ready in time for this
RFC). It is included in this submission just to give people a complete
picture of the implementation. The patch will enable rpc.statd to put
the correct taken-over IPv4 address in standard dot notation into the
3rd parameter of ha_callout program (see man rpc.statd for details) for
"add-client" event. Upon "del-client" event, we would assume the
monitored host should be removed from server-wide lists, regardless
individual server's interface.
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