GMPLS update - 36: updating standard in-segment statistics entries

Updated #standard #in-segment #statistics entries in GMPLS module. Updated statistics #iterator routines and #mapper #routine used by the agent framework with the standard #in-segment #indexing. This will remove the redundant indexing schemes and reduce the memory requirement of the statistics entries.

#GMPLS update 36 ...
[commit 31f39eb713378c88ee358d6706f9b73293f13f39] (https://github.com/nes-repo/NES-Open-Switch/commit/31f39eb713378c88ee358d6706f9b73293f13f39)