Add port_forwarding to neutron configuration.

This patch add the support to configure the port_forwarding plugin on
the neutron agent nodes.

Here is the doc for deployment:
https://docs.openstack.org/neutron/rocky/admin/config-fip-port-forwardings.html

Client implementation is currently pending.

Change-Id: I39a6fc63fa6419f63dac4f20863eb852f2527b26

defaults/main.yml

@@ -330,6 +330,7 @@ neutron_notifications_designate: notifications_designate
 #   - metering
 #   - qos
 #   - dns
+#   - port_forwarding
 neutron_plugin_base:
   - router
   - metering

templates/l3_agent.ini.j2

@@ -49,6 +49,11 @@ agent_version = v2
 vpn_device_driver = {{ neutron_driver_vpnaas }}
 {% endif %}
 
+{% if neutron_port_forwarding|bool %}
+# Port Fowarding
+{% set _ = l3_agent_plugins.append("port_forwarding") %}
+{% endif %}
+
 {% if l3_agent_plugins|length > 0 %}
 [AGENT]
 extensions = {{ l3_agent_plugins | join(',') }}

vars/main.yml

@@ -297,6 +297,12 @@ neutron_bgp_speaker_driver: neutron_dynamic_routing.services.bgp.agent.driver.ry
 
 neutron_bgp_router_id: "{{ neutron_local_ip }}"
 
+###
+### port_forwarding
+###
+
+neutron_port_forwarding: "{{ ('port_forwarding' in neutron_plugin_base) | ternary('True', 'False') }}"
+
 ###
 ### Services info
 ###