Comment 7 for bug 1809190

To completely address the issue, I think work also needs to be done on the neutron-openvswitch charm for scenarios where neutron-gateway is not used.

https://opendev.org/openstack/charm-neutron-openvswitch/src/commit/677a31b95ecc261446b92fd2608c34f08061d6aa/config.yaml#L103-L114