Move RxNetty support to test scope

The RxNetty runtime support is not meant to be officially supported and
should be restricted to testing purposes only.

Issue: SPR-15444

spring-webflux/src/main/java/org/springframework/web/reactive/DispatcherHandler.java

@@ -183,7 +183,6 @@ public class DispatcherHandler implements WebHandler, ApplicationContextAware {
 	 * @see HttpWebHandlerAdapter
 	 * @see org.springframework.http.server.reactive.ServletHttpHandlerAdapter
 	 * @see org.springframework.http.server.reactive.ReactorHttpHandlerAdapter
-	 * @see org.springframework.http.server.reactive.RxNettyHttpHandlerAdapter
 	 * @see org.springframework.http.server.reactive.UndertowHttpHandlerAdapter
 	 */
 	public static HttpHandler toHttpHandler(ApplicationContext context) {

spring-webflux/src/main/java/org/springframework/web/reactive/function/server/RouterFunctions.java

@@ -46,7 +46,7 @@ import org.springframework.web.server.adapter.WebHttpHandlerBuilder;
  *
  * <p>Additionally, this class can {@linkplain #toHttpHandler(RouterFunction) transform} a
  * {@code RouterFunction} into an {@code HttpHandler}, which can be run in Servlet 3.1+,
- * Reactor, RxNetty, or Undertow.
+ * Reactor, or Undertow.
  * And it can {@linkplain #toHandlerMapping(RouterFunction, HandlerStrategies) transform} a
  * {@code RouterFunction} into an {@code HandlerMapping}, which can be run in a
  * {@code DispatcherHandler}.
@@ -188,8 +188,6 @@ public abstract class RouterFunctions {
 	 * {@link org.springframework.http.server.reactive.ServletHttpHandlerAdapter},</li>
 	 * <li>Reactor using the
 	 * {@link org.springframework.http.server.reactive.ReactorHttpHandlerAdapter},</li>
-	 * <li>RxNetty using the
-	 * {@link org.springframework.http.server.reactive.RxNettyHttpHandlerAdapter}, or </li>
 	 * <li>Undertow using the
 	 * {@link org.springframework.http.server.reactive.UndertowHttpHandlerAdapter}.</li>
 	 * </ul>
@@ -212,8 +210,6 @@ public abstract class RouterFunctions {
 	 * {@link org.springframework.http.server.reactive.ServletHttpHandlerAdapter},</li>
 	 * <li>Reactor using the
 	 * {@link org.springframework.http.server.reactive.ReactorHttpHandlerAdapter},</li>
-	 * <li>RxNetty using the
-	 * {@link org.springframework.http.server.reactive.RxNettyHttpHandlerAdapter}, or </li>
 	 * <li>Undertow using the
 	 * {@link org.springframework.http.server.reactive.UndertowHttpHandlerAdapter}.</li>
 	 * </ul>

spring-webflux/src/main/java/org/springframework/web/reactive/socket/server/support/HandshakeWebSocketService.java

@@ -67,10 +67,6 @@ public class HandshakeWebSocketService implements WebSocketService, Lifecycle {
 			"reactor.ipc.netty.http.server.HttpServerResponse",
 			HandshakeWebSocketService.class.getClassLoader());
 
-	private static final boolean rxNettyPresent = ClassUtils.isPresent(
-			"io.reactivex.netty.protocol.http.server.HttpServerResponse",
-			HandshakeWebSocketService.class.getClassLoader());
-
 	private static final boolean undertowPresent = ClassUtils.isPresent(
 			"io.undertow.websockets.WebSocketProtocolHandshakeHandler",
 			HandshakeWebSocketService.class.getClassLoader());
@@ -112,9 +108,6 @@ public class HandshakeWebSocketService implements WebSocketService, Lifecycle {
 		else if (reactorNettyPresent) {
 			className = "ReactorNettyRequestUpgradeStrategy";
 		}
-		else if (rxNettyPresent) {
-			className = "RxNettyRequestUpgradeStrategy";
-		}
 		else if (undertowPresent) {
 			className = "UndertowRequestUpgradeStrategy";
 		}

spring-webflux/src/test/java/org/springframework/web/reactive/socket/adapter/RxNettyWebSocketSession.java

@@ -39,7 +39,8 @@ import org.springframework.web.reactive.socket.WebSocketSession;
 /**
  * Spring {@link WebSocketSession} implementation that adapts to the RxNetty
  * {@link io.reactivex.netty.protocol.http.ws.WebSocketConnection}.
- *
+ * For internal use within the framework.
+ * 
  * @author Rossen Stoyanchev
  * @since 5.0
  */

spring-webflux/src/test/java/org/springframework/web/reactive/socket/client/RxNettyWebSocketClient.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -47,7 +47,8 @@ import static io.reactivex.netty.protocol.http.HttpHandlerNames.WsClientDecoder;
 
 /**
  * {@link WebSocketClient} implementation for use with RxNetty.
- *
+ * For internal use within the framework.
+ * 
  * <p><strong>Note: </strong> RxNetty {@link HttpClient} instances require a host
  * and port in order to be created. Hence it is not possible to configure a
  * single {@code HttpClient} instance to use upfront. Instead the constructors

spring-webflux/src/test/java/org/springframework/web/reactive/socket/server/upgrade/RxNettyRequestUpgradeStrategy.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -35,6 +35,7 @@ import org.springframework.web.server.ServerWebExchange;
 
 /**
  * A {@link RequestUpgradeStrategy} for use with RxNetty.
+ * For internal use within the framework.
  *
  * @author Rossen Stoyanchev
  * @since 5.0