Add missing [oslo_reports] options

The oslo.reports library provides some options under the [oslo_reports]
section. This change ensures these parameters are rendered by
the oslo-config-generator command.

Closes-Bug: #1940733
Change-Id: I5e30ef458bccb0921ce77b2d9ef875bec72d0619

etc/oslo-config-generator/manila.conf

@@ -8,6 +8,7 @@ namespace = oslo.log
 namespace = oslo.messaging
 namespace = oslo.middleware
 namespace = oslo.policy
+namespace = oslo.reports
 namespace = oslo.service.periodic_task
 namespace = oslo.service.service
 namespace = oslo.service.sslutils