Invaild uuid unknown in service_info

[HYSong]

/var/lib/openstack/lib/python3.8/site-packages/pycadf/identifier.py:73: UserWarning: Invalid uuid: unknown. To ensure interoperability, identifiers should be a valid uuid.
warnings.warn(('Invalid uuid: %s. To ensure interoperability, '

The above warning messages are cluttering in the service of Nova-API and Cinder-API log files.

I found that the id of service_info is initialize to taxonomy.UNKNOWN in https://opendev.org/openstack/keystonemiddleware/src/commit/c4b78c71e58d6540811279007b10e65e2319717b/keystonemiddleware/audit/_api.py#L250, and even if it is execute _get_service_info in https://opendev.org/openstack/keystonemiddleware/src/commit/c4b78c71e58d6540811279007b10e65e2319717b/keystonemiddleware/audit/_api.py#L282, the service.id is still an string or unknow value, because catalog has been normalized, and the param of id is removed in https://opendev.org/openstack/keystonemiddleware/src/commit/c4b78c71e58d6540811279007b10e65e2319717b/keystonemiddleware/auth_token/_request.py#L19. It will always cause the warning of 'Invalid uuid' in pycadf.