shorten long polling timeout

apollo-client/src/main/java/com/ctrip/framework/apollo/internals/RemoteConfigRepository.java

@@ -274,8 +274,8 @@ public class RemoteConfigRepository extends AbstractConfigRepository {
 
         logger.debug("Long polling from {}", url);
         HttpRequest request = new HttpRequest(url);
-        //no timeout for read
-        request.setReadTimeout(0);
+        //longer timeout for read - 1 minute
+        request.setReadTimeout(60000);
 
         transaction = Cat.newTransaction("Apollo.ConfigService", "pollNotification");
         transaction.addData("Url", url);

apollo-configservice/src/main/java/com/ctrip/framework/apollo/configservice/controller/NotificationController.java

@@ -40,7 +40,7 @@ import java.util.Set;
 @RequestMapping("/notifications")
 public class NotificationController implements MessageListener {
   private static final Logger logger = LoggerFactory.getLogger(NotificationController.class);
-  private static final long TIMEOUT = 360 * 60 * 1000;//6 hours
+  private static final long TIMEOUT = 30 * 1000;//30 seconds
   private final Multimap<String, DeferredResult<ResponseEntity<ApolloConfigNotification>>>
       deferredResults = Multimaps.synchronizedSetMultimap(HashMultimap.create());
   private static final ResponseEntity<ApolloConfigNotification>