In HA mode, the master is down and cannot be consumed from the slave

[Braveheart7854]

I have met two conditions.

1. The configuration slaveReadEnable is true;
2. I didn't open the consumption of order messages. but, still fail to consume the message of slave.

[francisoliverlee]

try debug it , from code to see it support consume from slave https://github.com/apache/rocketmq-client-go/blob/master/internal/route.go#L252-L311