LAG update - 4: agent cleanup

#Cleaning up the #agent #framework in LAG module. Corrected #agent #identifier for custom LAG configuration parameters. Correcting the overall #aggregated #port #speed as overall #bandwidth.

#LAG update 12 ...
[commit a84c013c4bc1017d0e4b5552ff7f422432b4c5dd] (https://github.com/nes-repo/NES-Open-Switch/commit/a84c013c4bc1017d0e4b5552ff7f422432b4c5dd)