[stable 9] usbus entries in network namespace?

[Sean Bruno]

I note that on stable/9 the usbus seems to be inserting itself into the
list of network links.  What is this all about and how do I turn it off?

-bash-4.2$ netstat -i
Name    Mtu Network       Address              Ipkts Ierrs Idrop
Opkts Oerrs  Coll
bce0   1500 <Link#1>      00:25:64:f9:6d:b2    97002     0     0
33380     0     0
bce0   1500 10.73.149.0   x50                  33623     -     -
33322     -     -
bce0   1500 fe80::225:64f fe80::225:64ff:fe        0     -     -
0     -     -
bce1*  1500 <Link#2>      00:25:64:f9:6d:b4        0     0     0
0     0     0
bce2*  1500 <Link#3>      00:25:64:f9:6d:b6        0     0     0
0     0     0
bce3*  1500 <Link#4>      00:25:64:f9:6d:b8        0     0     0
0     0     0
usbus     0 <Link#5>                               0     0     0
0     0     0
usbus     0 <Link#6>                               0     0     0
0     0     0
usbus     0 <Link#7>                               0     0     0
0     0     0
usbus     0 <Link#8>                               0     0     0
0     0     0
usbus     0 <Link#9>                               0     0     0
0     0     0
usbus     0 <Link#10>                              0     0     0
0     0     0
lo0   16384 <Link#11>                              0     0     0
0     0     0
lo0   16384 localhost     ::1                      0     -     -
0     -     -
lo0   16384 fe80::1%lo0   fe80::1                  0     -     -
0     -     -
lo0   16384 your-net      localhost                0     -     -
0     -     -