are in the vnodes experiment on that node. This list of IPs is given
to the kernel as interfaces that a jail is allowed to bind too (those
kernel changes done by Mike). To construct this list, first look at
the list of virt_tunnels on that physnode for the experiment. In
addition, to support local jails, look at the IP list in the
interfaces table for the physnode. Basically like a doifconfig. At
some point local jails will change to use tunnels also, but for now
this will do.