Option "url" from group "neutron" is deprecated

This deprecation warning was found in nova-compute.log:

2019-07-17 22:34:53.692 21210 WARNING oslo_config.cfg [req-b8263f8d-b723-4f5f-868f-cff0806b440e - - - - -] Option "url" from group "neutron" is deprecated for removal (Endpoint lookup uses the service catalog via common keystoneauth1 Adapter configuration options. In the current release, "url" will override this behavior, but will be ignored and/or removed in a future release. To achieve the same result, use the endpoint_override option instead.). Its value may be silently ignored in the future.

Setup:

Bionic
OpenStack Queens
Juju 2.6.5
LXD containers [1]

LXD host:
Linux node-pytheas 4.15.0-54-generic #58-Ubuntu SMP Mon Jun 24 10:55:24 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

[1]: https://github.com/openstack-charmers/openstack-on-lxd