LAG upgrade - 17: updating member port debug parameters agent mapper routines

Updated #member #port #debug parameters agent routines in LAG module. The agent #iterator routines and #mapper #routine has been updated to use standard #member #port #based #indexing. This will access the member list embedded in the member port and there by removing the redundant indexing.

#LAG update 25 ...
[commit cbbb17345b86f6aae17e4c536c1b55a6154a0101] (https://github.com/nes-repo/NES-Open-Switch/commit/cbbb17345b86f6aae17e4c536c1b55a6154a0101)