router: fix vlog in lookup_table polluting table variable via stdout

router/route-update.sh

@@ -157,7 +157,7 @@ lookup_table()
     num=$(echo "$gateway" | sed -E 's/.*[.:]([0-9]+)$/\1/')
     if [ -n "$num" ] ; then
         echo "$num	$name" >> /etc/iproute2/rt_tables
-        vlog "Added rt_tables entry: $num $name"
+        vlog "Added rt_tables entry: $num $name" >&2
     fi
     echo "$num"
 }