Try almost indefinitely to re-establish a push connection (#11727)

Change-Id: I11e5affdda794dbb3ab63796f3a682fea76c6e44

client/src/com/vaadin/client/communication/AtmospherePushConnection.java

@@ -333,6 +333,7 @@ public class AtmospherePushConnection implements PushConnection {
             fallbackTransport: 'streaming',
             contentType: 'application/json; charset=UTF-8',
             reconnectInterval: '5000',
+            maxReconnectOnClose: 10000000, 
             trackMessageLength: true 
         };
     }-*/;