generated config doesn't include auth config in [neutron] section

[Corey Bryant]

tox -e genconfig on stable/2023.2 doesn't produce authentication config as noted by [1] for the [neutron] section.

[1] https://opendev.org/openstack/octavia/commit/3e6fd13bfb000785d5eb9efe2139ee739e074460

All that is generated is:

[neutron]

#
# From octavia
#

# DEPRECATED: A new endpoint to override the endpoint in the keystone catalog
# (string value)
# This option is deprecated for removal since 2023.2/Bobcat.
# Its value may be silently ignored in the future.
# Reason: The endpoint_override option defined by keystoneauth1 is the new name
# for this option.
#endpoint = <None>

# DEPRECATED: Endpoint interface in identity service to use (string value)
# This option is deprecated for removal since 2023.2/Bobcat.
# Its value may be silently ignored in the future.
# Reason: This option was replaced by the valid_interfaces option defined by
# keystoneauth.
#endpoint_type = <None>

# DEPRECATED: CA certificates file path (string value)
# This option is deprecated for removal since 2023.2/Bobcat.
# Its value may be silently ignored in the future.
# Reason: The cafile option defined by keystoneauth1 is the new name for this
# option.
#ca_certificates_file = <None>

[Gregory Thiemonge (gthiemonge)]

Thanks for the report,

I think we should fix it by dynamically building the list of [neutron] options in https://opendev.org/openstack/octavia/src/branch/master/octavia/opts.py#L46