GMPLS update - 59: optimizing standard out-segment entries

Optimized #standard #out-segment #entries in GMPLS module. This #removes the #attributes like #pointer to #extra #parameters. The hard-linked #custom #out-segment entries provides the extra #parameters on the segment which satisfies the same requirement. The custom out-segment entry holds attributes like #swap-label and #top-label. This will reduce the memory requirement associated with the out-segment entries.

#GMPLS update 59 ...
[commit 5fa265b017cb2bc96c629cebc705635a876173dc] (https://github.com/nes-repo/NES-Open-Switch/commit/5fa265b017cb2bc96c629cebc705635a876173dc)