update_firewall-script_ipt-gateway.sh: don't restart firewall on read-only systems.

update_firewall-script_ipt-gateway.sh

@@ -329,6 +329,14 @@ done
 
 blank_line
 
+if [[ -d "/ro" ]] && [[ -d "/rw" ]] ; then
+   restart_ipv4_firewall=false
+   restart_ipv6_firewall=false
+
+   info "Restarting firewall is ommited - Read only system."
+fi
+
+
 echononl "Restart IPv4 Firewall.."
 if $restart_ipv4_firewall ; then
    /usr/local/sbin/$IPV4_FIREWALL_SCRIPT > /dev/null 2> "$log_file"