interfaceio: TunTap now truncates .name
interfaceio: TunTap now truncates .name

When letting TunTap generate a new interface name, the .name property
was getting null characters in it.  It probably always was.  We now
chop them off.

MurphyMc/pox,MurphyMc/pox,MurphyMc/pox,MurphyMc/pox,MurphyMc/pox