Fix test case for keys in black list in PutKv command.

Author: ShannonDing

namesrv/src/test/java/org/apache/rocketmq/namesrv/processor/RequestProcessorTest.java

@@ -114,9 +114,9 @@ public void testProcessRequest_PutKVConfig() throws RemotingCommandException {
         // use key in black list
         RemotingCommand requestFailed = RemotingCommand.createRequestCommand(RequestCode.PUT_KV_CONFIG,
                 header);
-        request.addExtField("namespace", "namespace");
-        request.addExtField("key", "configBlackList");
-        request.addExtField("value", "value");
+        requestFailed.addExtField("namespace", "namespace");
+        requestFailed.addExtField("key", "configBlackList");
+        requestFailed.addExtField("value", "value");
 
         RemotingCommand responseFailed = defaultRequestProcessor.processRequest(null, requestFailed);