-add support for llc based protocols (iso, etc..) for ethernet

-add support for llc based protocols (iso, etc..) for ethernet
 by checking the proto against the ethermtu and bumping
 the link-layer offset by two.

-add support for vlan and mpls hierarchies by not absolute
  setting offsets but rather incrementing them;

  example(s):

  mpls 100000 && mpls 1024
    =filters for outerlabel 100000 and inner label 1024
  vlan 100 && vlan 200
    =filters for vlan 200 encapsulated withing vlan 100
  vlan 300 && mpls 17
    =filters for mpls label 17 encapsulated in vlan 300