Currently tun/tap only supports the EN10MB ARP type.  For use with
wireless and other networking types it should be possible to set the
ARP type via an ioctl.

Patch v2: Included check that the tap interface is down before changing the
link type out from underneath it
Signed-off-by: NMike Kershaw <dragorn@kismetwireless.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>