Add event types.

- Stop serializing JSONMessage in favor of events.Message.
- Keep backwards compatibility with JSONMessage for container events.

Signed-off-by: David Calavera <david.calavera@gmail.com>

daemon/update.go

@@ -54,5 +54,7 @@ func (daemon *Daemon) update(name string, hostConfig *container.HostConfig) erro
 		}
 	}
 
+	daemon.LogContainerEvent(container, "update")
+
 	return nil
 }