GMPLS update - 33: adding standard extended TE tunnel parameters

#Added #standard #extended #TE #tunnel parameters in the GMPLS module. This include the #extended #tunnel #parameters for #bi-directional operation as well as parameters to specify the #TE-Node #identifiers as the #head and #tail #nodes for #mpls-tunnels. The #opposite-dir-tunnel pointer is used to refer the tunnel in the #reverse #direction for co-routed bi-directional or associated bi-directional tunnels. The #reverse #LSP could be a #different #LSP of the #same #tunnel in #co-routed #bi-directional use-case or the #same #LSP could function for #both the #directions. For #associated #bi-directional tunnel the #reverse #LSP will be part of an entirely #different #tunnel. The #tunnel-index and the #tunnel-instance parameters specify the respective indexes in the #reverse #tunnel for an associated bi-directional tunnel.

#GMPLS update 33 ...
[commit 45fb2dcfe012aaf02b4c2b417b0c5c5de68a5b86] (https://github.com/nes-repo/NES-Open-Switch/commit/45fb2dcfe012aaf02b4c2b417b0c5c5de68a5b86)