Vlan EVENT patch

[David Christensen]

> > So, it won't hurt if it shows up in ifconfig, and it can be
> controlled, but
> > definitely helps our job, the administrators'.
>
> OK, if people feel strongly about this, and someone wants to implement
> the
> code in ifconfig I'll go along with it.

I believe there are some valid reasons when you consider virtualization
with Xen where you need to pass VLAN tags to the hypervisor.  Not sure
if Xen is running on FreeBSD yet but I can definitely see the need.

dave