bugfix: tunnels: Unable to route to connections across tunnel

Firewall rules don't get called because vtund is at /usr/sbin/vtund not /usr/bin/vtund

Also make the check if line posix compatible while we are chaning the path to be sure it works in the future too.

files/etc/hotplug.d/iface/13-vtun

@@ -1,6 +1,6 @@
 #!/bin/sh
 # Handles setting up rules for tunnel interfaces               
-if [[ -x "/usr/bin/vtund" ]]
+if [ -x "/usr/sbin/vtund" ]
 then
   ISVPN=false
   case "$INTERFACE" in
@@ -19,4 +19,4 @@ then
        # echo "$INTF down" >> /tmp/vtundscript.log            
     fi                           
   fi 
-fi
+fi