Monitor coordinator pids for update notifiers
Monitor coordinator pids for update notifiers

We were leaking fabric_db_update_listener rexi workers. This uses the
new couch_event configurability to have the workers automatically exit
when the coordinator dies.

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