Bridge CoS update - 2

Added optimizations for  #port #level #effective ( #remapped ) #CoS to #traffic-class #mapping in ethernet module. The optimization reduces memory used for maintaining this configuration in ethernet module. The traffic-class decides the #QoS treatment for ethernet frames. The remapped CoS which was deduced from the ingress CoS is used for deciding the traffic-class to be applied. By default - without any configuration present, all CoS values are mapped to same default traffic-class 0.

#Ethernet update 63 ...
[commit e21c37a8db62c1e13e5ae10c0074fe68585bc654]