kafka consumer meet message for the same row with large offset but smaller commit-ts

[3AceShowHand]

The kafka consumer receive message for the same row, which at larger offset but the commit-ts is smaller than the previous messages, this may caused by the Kafka sink send message out of order.

At the moment, we think this may caused by the issue:

• AsyncProducer produces messages in out-of-order when retries happen IBM/sarama#2619

This cannot be reproduced by the internal tests now, we are adding more test cases.