Comment 8 for bug 1934129

I've just discovered that the patch above has a critical issue in that if you set enable-fwaas=false for < V it will correctly remove the package but not remove firewall service plugin. Since neutron-server does not get restarted the error only occurs one neutron-server gets restarted. So the issue is this remains:

# grep -r service_plugins /etc/neutron/
/etc/neutron/neutron.conf:service_plugins = router,firewall_v2,metering,segments,neutron_dynamic_routing.services.bgp.bgp_plugin.BgpPlugin

i.e. "firewall_v2"

I will prepare a patch now to fix this.