GMPLS interface update - 1: added MPLS interface create/remove sequence

Added #MPLS-interface #create / #remove #sequence in GMPLS module. This enables to #create #MPLS-interface s #through the #IF #module #interface #management operations. On creating the MPLS logical-interface in the IF module the corresponding interface is created in the GMPLS module through the logical-interface handler routine. On removing the MPLS logical-interface in IF module, corresponding operations are performed in GMPLS module accordingly. The #MPLS-interface #activation and #ADMIN-STATUS operations are performed in the GMPLS module #through the appropriate logical-interface #handler #routine s defined by GMPLS module for the same, and the triggers for these operations are passed from the IF module to GMPLS module through these handlers.

#GMPLS update 10 ...
[commit b7ac22f2c0ecbd173325f8331640ab3399ba9f2c] (https://github.com/nes-repo/NES-Open-Switch/commit/b7ac22f2c0ecbd173325f8331640ab3399ba9f2c)