iostat does not show drives which are handled by KLDs

[Tomaž Borštnar <tomaz.borstnar@xxxxxxxx>]

I load ServeRAID driver via ips_load in loader.conf which works fine, but screws up iostat output:

host# iostat 1
      tty            acd0              cd0            pass0             cpu
 tin tout  KB/t tps  MB/s   KB/t tps  MB/s   KB/t tps  MB/s  us ni sy in id
   0    0  0.00   0  0.00   0.00   0  0.00   0.00   0  0.00   0  0  0  0  0
   0    0  0.00   0  0.00   0.00   0  0.00   0.00   0  0.00   0  0  0  0  0
   0    0  0.00   0  0.00   0.00   0  0.00   0.00   0  0.00   0  0  0  0  0
   0    0  0.00   0  0.00   0.00   0  0.00   0.00   0  0.00   0  0  0  0  0

These info are good to have.

Tomaž