Ethernet phy update - 16: phy port cleanup

Added corrections in #provider #backbone #bridge ( #PBB ) #phy #port #handler routines in bridge module. Updated provider bridge virtual instance port ( #VIP ) and provider instance port ( #PIP ) #create / #remove routines in accordance with the latest phy framework. Also updated provider backbone bridge agent framework for general corrections. Removed obsolete phy related routines from the ethernet module.

#Ethernet update 126 + #802-1AH update 31 ...
[commit 24292aeee6960e017f111951709b0904dba24773] (https://github.com/nes-repo/NES-Open-Switch/commit/24292aeee6960e017f111951709b0904dba24773)