LAG update - 5: starting framework upgrade

#Upgrading the #agent #framework for #aggregator and #member #ports in LAG module. Added new upgraded data-structures for aggregator and member ports for upgrade.

#LAG update 13 ...
[commit a9034b687009c1fe73011dc8285657f4ab99aba7] (https://github.com/nes-repo/NES-Open-Switch/commit/a9034b687009c1fe73011dc8285657f4ab99aba7)