Fix mqtt disconnect due to appId permission bug when namespace policies update #1813
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Motivation
MQTTConsumer appId field is equivalent to the userRole in Authentication. The appId field will be used to do checkPermissionsAsync when namespace policies update.
https://github.com/apache/pulsar/blob/0a949de4bfa3734194be87a8655763a4411be1b6/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/Consumer.java#L1042-L1044
Modifications
Before: appId is set to ""
After: appId is set to connection.getUserRole()
Verifying this change
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