ChItZZZ

Results 2 issues of ChItZZZ

### Contribution Checklist Master issue: [issue 816 ](https://github.com/apache/pulsar-client-go/issues/816) ### Motivation support consumer to send ack request and get response synchronously ### Modifications 1. add closeCh waiting after send ackRequest 2....

#### Expected behavior When I set consumer option AckWithResponse = true, should return some err when ack fail #### Actual behavior req.err always be nil #### Steps to reproduce ####...