1ef6088bb6
The topic names need to be consistent between event types to ensure people can properly use wildcards to filter the messages on just the things they care about. However playbook and task were inconsistent in topics from between different methods in the callback plugin. This commit fixes that by making sure we always use 'playbook' and 'task', not 'playbooks' or 'tasks'. Change-Id: I3e6240560ad562e8f41f7e314ef7a4b0b1178e32