Bridge CoS update - 15

Added changes in ethernet module for traversing #port #level #priority #code #point ( #PCP ) #encoding configuration on provider bridges. The new changes enables to #traverse through the optimized configuration entries. The #agent #framework uses these for #GETNEXT functionality among the configuration entries.

#Ethernet update 96 ...
[commit 31263afc3940867eeefa3770f9b4dfe2ae855fd0]