multi: add shutdown logs in subservers

This commit adds a simple shutdown to every subserver to assist
debugging.

routing/router.go

@@ -691,7 +691,7 @@ func (r *ChannelRouter) Stop() error {
 		return nil
 	}
 
-	log.Tracef("Channel Router shutting down")
+	log.Info("Channel Router shutting down")
 
 	// Our filtered chain view could've only been started if
 	// AssumeChannelValid isn't present.