LACP upgrade - 13: cleaning up LAG module

Cleaned up #LAG and #LACP modules with #miscellaneous #changes. Corrected the #PDU #handler in LACP module. Reordered PDU buffer data-structure. Removed definitions of the old module data-structures in LAG module. Corrected #aggregator #member-port #list iterator routine. Corrected #member-port #statistics iterator routines with direct references from member-port configuration entries. Updated #custom #aggregator configuration entries with direct reference from the aggregator configuration entries.

#LACP update 26 ...
[commit a64084632d865d7e2dbbbe553d7bc4d64f4bea43] (https://github.com/nes-repo/NES-Open-Switch/commit/a64084632d865d7e2dbbbe553d7bc4d64f4bea43)