Ethernet 802-1Q framework optimization + VLAN rewrite update

Added some #optimization on basic #module #framework in #ethernet module for 802-1Q support. Renamed #VLAN #ingress #rewrite routines in ethernet module. Replaced some unnecessarily wide variables with shorter versions of them.

Ethernet update 42 ...
[commit 769b23fd9ce3c75c0aa400d7dd69d4aeda8b748c]