GMPLS update - 71: updating custom cross-connect agent mapper routines

Updated #custom #cross-connect agent mapper routines in GMPLS module. The agent #iterator routines and #mapper #routine has been updated to use standard #cross-connect entry based #indexing. This will access the cross-connect entries by using the #native #indexing. This removes references to the custom cross-connect indexing used earlier. This will reduce the memory requirement associated with the custom cross-connect entries. The custom cross-connect #entries add support for #label-stack #attributes like #cross-connect-type which indicate the cross-connect as part of LSP/pseudo-wire, also it indicates whether cross-connect is used in #HLSP or #SLSP modes.

#GMPLS update 71 ...
[commit feed37bae874c1fa5f8623fe0f9b1384892d61b1] (https://github.com/nes-repo/NES-Open-Switch/commit/feed37bae874c1fa5f8623fe0f9b1384892d61b1)