Fix triggers for release-approval pipeline
Fix triggers for release-approval pipeline

The release-approval pipeline implemented a nice infinite loop as
it was triggered by all comment-added events, and Zuul is posting one
every time the job runs.

Add a regexp to exclude comment-added events from the 'zuul' user.

Also since patchset-created actually does not trigger comment-added,
it needs to be specified separately (in order to approve releases
proposed by the PTL themselves).

Change-Id: I0f8b8526adaa83876ff92a98500d35c70cc23174

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