Fix create_shorewall_vars function as Grep default behaviour has changed since version 2 and 3

functions.sh

@@ -177,7 +177,7 @@ function create_shorewall_vars () {
 		mkdir -p $shorewall_dir
 	fi
 
-    grep "ifconfig-push" $CCDDIR* | sed "s/[\/|:]/ /g" | sed "s/-//g" | awk '{print $4 "=" $6}' > $SHOREWALLVARS
+    grep -H "ifconfig-push" $CCDDIR* | sed "s/[\/|:]/ /g" | sed "s/-//g" | awk '{print $4 "=" $6}' > $SHOREWALLVARS
 
 }