MFC r1.21  Use ETHER_BPF_MTAP so that the vlan tags are visible to bpf(4) when stacked  under a vlan.
MFC r1.21
 Use ETHER_BPF_MTAP so that the vlan tags are visible to bpf(4) when stacked
 under a vlan.

Approved by:	re (kensmith)

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