Ethernet & Bridge stacking update

Added changes for supporting #VLAN, #bridge and #ILAN type interfaces in ethernet module. These are required for generic ethernet #interface #stacking.

#Ethernet update 5 ...

Added changes for #PIP interface type support in bridge module. For interface stacking of #VIP and CNP in #PBB (provider backbone bridging) this is required.

#802-1AH update 3 ...

[commit 8f337ff8f23152d8740f740478968f1df09f3e14]