reduce config service locator retry times to 2

Author: nobodyiam

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

@@ -105,7 +105,7 @@ private synchronized void updateConfigServices() {
     String url = assembleMetaServiceUrl();
 
     HttpRequest request = new HttpRequest(url);
-    int maxRetries = 5;
+    int maxRetries = 2;
     Throwable exception = null;
 
     for (int i = 0; i < maxRetries; i++) {