GMPLS update - 43: adding external API for GMPLS tunnel create

Added changes for #create / #removal of #GMPLS #tunnel #hierarchical #entries in GMPLS module. This involves the #creation of #dependent #configuration #entries as part of #tunnel / #LSP #create operation and #removal of these #cross #references which were created for maintenance of #dynamic #tunnel #state. On creating a tunnel entry, the #statistics entries are created for both #forward and #reverse traffic directions, the #GMPLS #configuration entry, the #extended #configuration entry and the #custom #configuration entry is created. A tunnel specific #error #entry is created to track the detailed tunnel state and the cause for the state.

#GMPLS update 43 ...
[commit d80c4a036d47c8433b1cce650ed9a3348469cc70] (https://github.com/nes-repo/NES-Open-Switch/commit/d80c4a036d47c8433b1cce650ed9a3348469cc70)