Kill couch_db_event when it has installed handlers
Kill couch_db_event when it has installed handlers

This is to force the upgrade switch to the new couch_event application
force update notifications. Theoretically we could accomplish the same
thing with custom appups to forcefully remove couch_db_event from the
supervision tree but it turns out that's really hard.

fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb