IF update - 11: updating custom logical interface entries

Updated the #custom #logical #interface configuration #create / #remove routines in IF module. The #agent level #traversal #routine s and #mapper routines has been #upgraded for the new data-structure changes. The #interface #activation #handler has been adapted for the new changes. This allows to directly create the logical interfaces by the operator.

#IF update 11 ...
[commit b235d3e2cf04471f99a2bb034d1469a2ce4ea24a] (https://github.com/nes-repo/NES-Open-Switch/commit/b235d3e2cf04471f99a2bb034d1469a2ce4ea24a)