Value is duplicated in log message (oslo_messaging_notifications.driver)

[EunYoung Kim]

Hello,
When I set a value in 'glance-api.conf', the value is printed duplicated in the log message.

I think it does not affect operation, but some people may be confused.
I confirmed the function(notifications to MQ) works correctly.

* Config:
  - section: oslo_messaging_notifications
  - key: driver
  - value: messagingv2

* Expected: ...oslo_messaging_notifications.driver = ['messagingv2']...
* Actual: ...oslo_messaging_notifications.driver = ['messagingv2', 'messagingv2']...

======================
* Actual full log line
2022-11-11 15:45:15.090 317397 DEBUG glance.common.config [-] oslo_messaging_notifications.driver = ['messagingv2', 'messagingv2'] log_opt_values /usr/lib/python3/dist-packages/oslo_config/cfg.py:2609

* glance-api.conf
...
[oslo_messaging_notifications]
driver = messagingv2
...

======================
* Actual full log line with multiple values
2022-11-11 15:06:59.093 309559 DEBUG glance.common.config [-] oslo_messaging_notifications.driver = ['messagingv2,log', 'messagingv2,log'] log_opt_values /usr/lib/python3/dist-packages/oslo_config/cfg.py:2609

* glance-api.conf
...
[oslo_messaging_notifications]
driver = messagingv2,log
...

======================
* Environment: Ubuntu package, Zed release

I attached a screenshot of part of the log message. (/var/log/glance-api.log)
If you have trouble with reproduce or lack of information, please let me know.