docs: def _domain_event_tray_change_cb(conn, domain, dev, reason, opaque):
      '''
      Domain tray change events handler
      '''
      _salt_send_domain_event(opaque, conn, domain, opaque['event'], {
          'dev': dev,
          'reason': _get_libvirt_enum_string('VIR_DOMAIN_EVENT_TRAY_CHANGE_', reason)
      })