Add namespace support for transaction message (#1254)

client/src/main/java/org/apache/rocketmq/client/producer/TransactionMQProducer.java

@@ -86,6 +86,7 @@ public class TransactionMQProducer extends DefaultMQProducer {
             throw new MQClientException("TransactionListener is null", null);
         }
 
+        msg.setTopic(NamespaceUtil.wrapNamespace(this.getNamespace(), msg.getTopic()));
         return this.defaultMQProducerImpl.sendMessageInTransaction(msg, null, arg);
     }