Clean up netd state when tethering fails.

If we do not call untether, NetworkController will still think
that wlan0 is part of the LOCAL network, and thus any attempt to
use wlan0 for anything else is doomed to fail.

Bug: 27917299
Change-Id: Ibb63f6b477b85b92281d9667adf8af148deb266c
1 file changed