423915 - WebSocket / Active connection from IOS that goes into airplane mode not disconnected on server side

+ Working testcase for JSR-356

jetty-websocket/javax-websocket-server-impl/src/test/java/org/eclipse/jetty/websocket/jsr356/server/browser/JsrBrowserDebugTool.java

@@ -90,6 +90,7 @@ public class JsrBrowserDebugTool
         server.setHandler(context);
 
         ServerContainer container = WebSocketServerContainerInitializer.configureContext(context);
+        container.setDefaultMaxSessionIdleTimeout(5000);
         container.addEndpoint(JsrBrowserSocket.class);
 
         LOG.info("{} setup on port {}",this.getClass().getName(),port);

jetty-websocket/websocket-common/src/main/java/org/eclipse/jetty/websocket/common/io/AbstractWebSocketConnection.java

@@ -178,6 +178,7 @@ public abstract class AbstractWebSocketConnection extends AbstractConnection imp
         this.ioState.addListener(this);
         this.flusher = new Flusher(generator,endp);
         this.setInputBufferSize(policy.getInputBufferSize());
+        this.setMaxIdleTimeout(policy.getIdleTimeout());
     }
 
     @Override