IF update - 13: updating logical interface status handler

Updated the #logical-interface #hierarchical #status #handling routines in IF module. The #status #change #handler routines has been #upgraded for the new data-structure changes. The hierarchical status handler #propagate s the interface #status #from the #lower interface #layer s #to the #higher #layer s. The interface #stacking enables the interface status to be decided based on the lower layer component interfaces. The interface status will depend on it's own #ADMIN-STATUS, #interface-type dependent #procedure s and #lower layer #interface #OPER-STATUS.

#IF update 13 ...
[commit 742604fca8f7d8c60f7e88afe52c7de58c33fc90] (https://github.com/nes-repo/NES-Open-Switch/commit/742604fca8f7d8c60f7e88afe52c7de58c33fc90)