[grid] Node server graceful shutdown

Signed-off-by: Viet Nguyen Duc <[email protected]>

Author: VietND96

java/src/org/openqa/selenium/grid/node/httpd/NodeServer.java

@@ -50,7 +50,6 @@
 import org.openqa.selenium.grid.config.Role;
 import org.openqa.selenium.grid.data.NodeAddedEvent;
 import org.openqa.selenium.grid.data.NodeDrainComplete;
-import org.openqa.selenium.grid.data.NodeRemovedEvent;
 import org.openqa.selenium.grid.data.NodeStatusEvent;
 import org.openqa.selenium.grid.log.LoggingOptions;
 import org.openqa.selenium.grid.node.HealthCheck;
@@ -77,8 +76,7 @@ public class NodeServer extends TemplateGridServerCommand {
   private final AtomicBoolean nodeRegistered = new AtomicBoolean(false);
   private Node node;
   private EventBus bus;
-  private final Thread shutdownHook =
-      new Thread(() -> bus.fire(new NodeRemovedEvent(node.getStatus())));
+  private final Thread shutdownHook = new Thread(() -> node.drain());
 
   @Override
   public String getName() {