Octavia recently introduced keystoneauth options to the [neutron]
section, and these will be required in a future release. This
introduces support for the basic keystoneauth options to meet that
requirement.
The default values intentionally lack the password value, which
triggers the fallback logic in Octavia to use service_auth options
instead.
Depends-on: https://review.opendev.org/c/openstack/octavia/+/866327
Change-Id: I72c61970e4878c2a06fd42026e53b788943cf945
296a7a31ff