LACP upgrade - 10: updating LACP PDU partner info handler

Updated the LACP #PDU #handler in #LACP module. This handler will #process the #PDU while #received on port. The #peer #partner #info of the received port is #updated from the info received in the LACP PDU. The info in the PDU is checked against the actor port specific info to #decide whether the #peer port is in #sync with the received port. The partner info like oper-port, oper-priority, oper-system-id, oper-system-priority, oper-key and oper-stat are populated according to the values received from LDU. The actor specific info like port, port-priority, system-id, system-priority and oper-key are cross checked with the info in PDU to decide whether synchronization has been attained with the peer port.

#LACP update 23 ...
[commit 4b8005f9df419c5b8f573ca219af71cc45c67a10] (https://github.com/nes-repo/NES-Open-Switch/commit/4b8005f9df419c5b8f573ca219af71cc45c67a10)