enable tcp no delay for netty 3 server (apache#1746)

Author: nobodyiam

dubbo-remoting/dubbo-remoting-netty/src/main/java/com/alibaba/dubbo/remoting/transport/netty/NettyServer.java

@@ -74,6 +74,7 @@ protected void doOpen() throws Throwable {
         // https://issues.jboss.org/browse/NETTY-365
         // https://issues.jboss.org/browse/NETTY-379
         // final Timer timer = new HashedWheelTimer(new NamedThreadFactory("NettyIdleTimer", true));
+        bootstrap.setOption("child.tcpNoDelay", true);
         bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
             public ChannelPipeline getPipeline() {
                 NettyCodecAdapter adapter = new NettyCodecAdapter(getCodec(), getUrl(), NettyServer.this);
@@ -153,4 +154,4 @@ public boolean isBound() {
         return channel.isBound();
     }
 
-}
+}