no longer worked. The problem was that the defines used the
same space as the VLAN id. This commit does three things.
1) Move the LRO used fields to the PH_per fields. This is
   safe since the entire PH_per is used for IP reassembly
   which LRO code will not hit.
2) Remove old unused pace fields that are not used in mbuf.h
3) The VLAN processing is not in the mbuf queueing code. Consequently
   if a VLAN submits to Rack or BBR we need to bypass the mbuf queueing
   for now until rack_bbr_common is updated to handle the VLAN properly.

Reported by:	Brad Davis