Another minor bugfix; sys device is not a regular file.

bin/setup-vpn.sh

@@ -246,7 +246,7 @@ EOF
 
 	    # XXX: do this in a script on server-side, somehow
 	    i=8
-	    while [ ! -f /sys/class/net/tun-$aggprefix -a $i -gt 0 ]; do
+	    while [ ! -e /sys/class/net/tun-$aggprefix -a $i -gt 0 ]; do
 		i=`expr $i - 1`
 		sleep 1
 	    done