Do not post comments in release-approval pipeline
Do not post comments in release-approval pipeline

Since it rus on every (human) comment, the release-approval pipeline
can get pretty noisy. It's also not that critical to read (failure
generally meaning that you don't have the required +1s yet).

This change disables comment posting on success/failure in the pipeline.

Change-Id: I4808a84cd39a5a19ddad86b548ec18d8cadf7430

openstack-infra/project-config,openstack-infra/project-config