fullstack: Use noop firewall
fullstack: Use noop firewall

Currently fullstack tests don't use hybrid plugging but they use hybrid
firewall by default. Using iptables is not segregated and OVS agents
running in parallel may interfere between each other.

This patch removes using iptables in ovs agents per created port.

Change-Id: Ic15c942360a4a6ecf0eb5d8ecbbc54e59b10431d
Closes-Bug: #1575033

openstack/neutron,cloudbase/neutron,noironetworks/neutron,bigswitch/neutron,huntxu/neutron,openstack/neutron,igor-toga/local-snat,mahak/neutron,mahak/neutron,sebrandon1/neutron,mahak/neutron,eayunstack/neutron,noironetworks/neutron,igor-toga/local-snat,openstack/neutron,eayunstack/neutron,bigswitch/neutron,huntxu/neutron,sebrandon1/neutron,cloudbase/neutron