GMPLS update - 73: updating custom out-segment agent mapper routines

Updated #custom #out-segment 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 entries by using the #native #indexing. This removes references to the custom out-segment indexing used earlier. This will reduce the memory requirement associated with the custom out-segment entries. The custom label-stack #entries add support for #out-segment #attributes like GMPLS #top-label, #swap-label, etc ... The custom out-segment #entries add support for #media #specific labels ( #Ethernet / #SONET / #SDH / #OTN ) by maintaining the GMPLS #label-type and #label-value #attributes.

#GMPLS update 73 ...
[commit f7a57600c601adeed30f95c5f47c79bc86c1ec25] (https://github.com/nes-repo/NES-Open-Switch/commit/f7a57600c601adeed30f95c5f47c79bc86c1ec25)