PBB customer backbone port update - 2

Added support for automatic creation and removal of virtual #ethernet #phy for customer backbone port ( #CBP ). This will create virtual phy as part of CBP activation and remove the virtual phy as part of CBP de-activation on a #PBB #IB-BEB bridge.

#802-1AH update 15 ...
[commit 6833e41149c7ef7a52da0fde162c5842971979ac]