GMPLS update - 52: optimizing standard in-segment entries

Optimized #standard #in-segment #entries in GMPLS module. This #removes the #attributes like #in-coming #label, #pointer to in-coming #label and #pointer to #traffic #parameter. The hard-linked #custom #in-segment entries provides #alternate #parameters which satisfies the same requirement and the traffic parameters are derived from the associated tunnel LSP. This will reduce the memory requirement associated with the in-segment entries.

#GMPLS update 52 ...
[commit d3d78c2506cc5c539cbd21d77d193ba91dd4d232] (https://github.com/nes-repo/NES-Open-Switch/commit/d3d78c2506cc5c539cbd21d77d193ba91dd4d232)