Got wrong error stack when using ACL

1. Please describe the issue you observed:

- What did you do (The steps to reproduce)?
Append 'aclEnable=true' in broker.conf, restart broker.
broker will load default config 'plain_acl.yml',
Use Producer sample,add ```producer.set_session_credentials('RocketMQ','12345678','')```
before ```producer.start()```,modify topic to ```topicA``` then run it.
- What did you expect to see?
Permission denied error stack.
- What did you see instead?
```
rocketmq.exceptions.ProducerSendSyncFailed: No route info of this topic: topicA,error:-1,in file rocketmq-client-cpp/src/producer/DefaultMQProducerImpl.cpp line:418
```
2. Please tell us about your environment:

- What is your OS?
osx10.14.6
- What is your client version?
2.0
- What is your RocketMQ version?
rocketmq4.7.0

Reproduce the ACL setup from broker.conf with plain_acl.yml, then run the Producer sample using set_session_credentials and topicA. Start by tracing the reported failure at rocketmq-client-cpp/src/producer/DefaultMQProducerImpl.cpp:418 and compare it with the expected permission-denied error. Done means the client reports the ACL denial rather than “No route info of this topic.”

Written by the indexing model from the issue text.