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Add route to trap neighbor advertisement messages to Agent.
Issue: In case of IPv6 Allowed Address Pair, when switchover happens to new interface, the traffic does not move to new interface. As part of switchover, Unsolicited Neighbor Advertisement message from new interface is not trapped to agent. Fix Agent now adds a route to trap IPv6 All Nodes Multicast address in each VRF so that Unsolicited Neighbor Advertisement message reaches agent. Agent, as part of this message processing updates the Allowed Address pair state machine so that route preference is updated for new interface and traffic starts flowing from new interface. Also define separate counters in agent for Solicited and Unsolicited Neighbor advertisement message. Also update the UT. Change-Id: Ibadaa5cbe84d973b6e284f7a412d9c583b363d32 Closes-Bug: #1592119
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