GMPLS update - 57: optimizing standard out-segment entries

Optimized #standard #out-segment #entries in GMPLS module. This #removes the #attributes like #top-label, #pointer #to top #label and #pointer to #traffic #parameter. The hard-linked #custom #out-segment entries provides #alternate #parameters which satisfies the same requirement and the traffic parameters are derived from the associated tunnel LSP. The custom out-segment entry holds attributes like #swap-label and #top-label. The removed standard attributes support only few media types, but the custom attributes supports #label-types for different media types. This will reduce the memory requirement associated with the out-segment entries.

#GMPLS update 57 ...
[commit cf9f530dd23d57563b2933c49ce9c7f76d082cf0] (https://github.com/nes-repo/NES-Open-Switch/commit/cf9f530dd23d57563b2933c49ce9c7f76d082cf0)