update /etc/default/shorewall to the stretch version

Signed-off-by: Mattia Rizzolo <mattia@debian.org>

TODO4stretch-host-upgrades.txt

 things to look at on jenkins.d.n. after the upgrade
 ---------------------------------------------------
 kept the jessie versions:
-	Configuration file '/etc/default/shorewall'
 	Configuration file '/etc/apache2/conf-available/security.conf'
 
 

hosts/jenkins/etc/default/shorewall

@@ -16,7 +16,7 @@ startup=1
 #    wait_interface=
 
 #
-# Global start/restart/stop options
+# Global start/restart options
 #
 OPTIONS=""
 
@@ -25,6 +25,11 @@ OPTIONS=""
 #
 STARTOPTIONS=""
 
+#
+# Restart options
+#
+RELOADOPTIONS=""
+
 #
 # Restart options
 #