Add fwaas_v2 log optional configuration in l3_agent.ini

When configuring fwaas_v2 log, we can specify rate_limit, burst_limit
and local_output_log_base options in nework_log section.

Change-Id: Iba061c399599cf601c22054b3924b9a74f0f4fa0

doc/source/admin/config-logging.rst

@@ -41,6 +41,11 @@ To enable the logging service, follow the below steps.
      [agent]
      extensions = log
 
+   .. note::
+
+       Fwaas v2 log is currently only supported by openvswitch, the firewall
+       logging driver of linuxbridge is not implemented.
+
 #. To enable logging service for ``firewall_group`` in Layer 3, add
    ``fwaas_v2_log`` to option ``extensions`` in section ``[AGENT]`` in
    ``/etc/neutron/l3_agent.ini`` for network nodes. For example:
@@ -51,8 +56,8 @@ To enable the logging service, follow the below steps.
      extensions = fwaas_v2,fwaas_v2_log
 
 #. On compute/network nodes, add configuration for logging service to
-   ``[network_log]`` in ``/etc/neutron/plugins/ml2/openvswitch_agent.ini`` as
-   shown bellow:
+   ``[network_log]`` in ``/etc/neutron/plugins/ml2/openvswitch_agent.ini`` and in
+   ``/etc/neutron/l3_agent.ini`` as shown bellow:
 
     .. code-block:: ini
 

neutron/opts.py

@@ -218,6 +218,8 @@ def list_l3_agent_opts():
          ),
         ('agent',
          neutron.conf.agent.agent_extensions_manager.AGENT_EXT_MANAGER_OPTS),
+        ('network_log',
+         neutron.conf.services.logging.log_driver_opts)
     ]