GMPLS update - 53: updating standard out-segment statistics entries

Updated #standard #out-segment #statistics agent mapper routines in GMPLS module. The agent #iterator routines and #mapper #routine has been updated to use standard out-segment entry based #indexing. This will access the out-segment statistics entries by using the #native #indexing. This removes references to the standard out-segment statistics indexing used earlier. The out-segment #statistics contain the #count for #packets and #bytes #sent on the out-segment, also #count for #packet #errors and packet #discard are separately maintained.

#GMPLS update 53 ...
[commit e41f00ed5cadd397b764814e5bb12bebeae8d311] (https://github.com/nes-repo/NES-Open-Switch/commit/e41f00ed5cadd397b764814e5bb12bebeae8d311)