Remove duplicated and unused code in iptables_firewall
Remove duplicated and unused code in iptables_firewall

Change-Id: I5312c4f3738c0fdaa1015a9d706883d6406b51bb

mahak/neutron,eayunstack/neutron,openstack/neutron,mahak/neutron,eayunstack/neutron,noironetworks/neutron,openstack/neutron,huntxu/neutron,huntxu/neutron,noironetworks/neutron,mahak/neutron,openstack/neutron