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declineLease can lose updateLease race

In both dhcp4_src.cc and dhcp6_srv.cc the declineLease method calls updateLease with a try-catch block so when it loses a race the updateLease throws. The processPacket method catches the exception and emits a generic process failure log.

IMHO it is a minor bug easy to fix.

Related to multi-threading even it is not MT specific.

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