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.

Change-Id: If1cd703bf06c76fa23c567e61434ef703c24daa0

etc/config-generator.conf

@@ -26,5 +26,6 @@ namespace = oslo.messaging
 namespace = oslo.db
 namespace = oslo.log
 namespace = oslo.policy
+namespace = oslo.reports
 namespace = oslo.service.periodic_tasks
 namespace = oslo.service.service