skeleton/S40network: tweak for debian ifupdown

Make the S40network script create the /run/network directory for the
debian variant of ifupdown which uses it as a lock directory.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Tested-by: Karoly Kasza <kaszak@gmail.com>
Reviewed-by: Karoly Kasza <kaszak@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

system/skeleton/etc/init.d/S40network

@@ -3,6 +3,9 @@
 # Start the network....
 #
 
+# Debian ifupdown needs the /run/network lock directory
+mkdir -p /run/network
+
 case "$1" in
   start)
  	echo "Starting network..."