switch from bpf_mtap to the shiny new bpf_mtap_stripvlan.

bpf listeners on a vlan interface don't expect to see a vlan header (you
expect those on the underlaying if). since we no longer prepend an ethernet
header to later throw it away and prepend an ether_vlan_header, we prepend
a ether_vlan_header right away. to unconfuse bpf listeners we need to cut
the 4 extra bytes out, which is what bpf_mtap_stripvlan does.
problem noticed by dlg with dhcrelay, ok benno dlg

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