Allow source IP to be specified on port forward firewall rule
Migrated from: https://tracker.clearos.com/view.php?id=574
Reported by: Peter Baldwin
It is common to want to only have a particular source IP connect to a ClearOS port forward rule. See example described in the old 5.1 documentation: http://www.clearcenter.com/support/documentation/clearos_enterprise_5.1/user_guide/advanced_firewall#forwarding_port_x_from_single_remote_ip_address