The ``FirewallPluginV2`` class is registering the logging driver [1] when is instantiated. The ``logapi`` register always loads the ``IptablesLoggingDriver``, regardless of ``fwaas_db`` driver loaded.

If Neutron is using ML2/OVN only, that means the neutron-fwaas project won't need the L3 agent. In that case it is not needed:

• To load the IPtables driver
• To register the RPC callbacks.
• To enable the RPC support (``requires_rpc``) in the new driver.

[1]https://github.com/openstack/neutron-fwaas/blob/2ffcdc83d4eee3636d8cbf373d3d5d38587f7596/neutron_fwaas/services/firewall/fwaas_plugin_v2.py#L80