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   Fix conflict when IKE SA and Child SA rekeying happen at the same time.

   If the IKE SA changes during an ongoing rekey exchange, messages may be
   lost because they were inteded for the old SA. An iked instance that is
   waiting for a rekey Child SA response will no longer reply to IKE SA
   rekey requests until the ongoing Child SA exchange has completed or
   timed out.

   ok sthen@

UnifiedSplitRaw