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kafka-acls will be modified to support namespace parameter, which if specified will let users specify acls for a namespace. Any entity created

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Prior to checking acls for any entity in a namespace, permission to access the particular namespace will be checked.

Namespace Configs

Currently, Kafka lets you provide cluster and topic level configs. However, for a multi-tenant Kafka cluster default configs for different namespaces could be different. We propose to allow configs be specified at namespace level. If a particular config is not specified at a topic level, but is specified at a namespace level, config value from namespace level should be honored. kafka-configs will need to be modified to support that.

Backwards Compatibility

The goal here is to make sure that any existing topic, without any namespace, continues to work as expected. All topics under /broker/topics will be part of default namespace, i.e., "". Any topic created without specifying a namespace will be part of the default namespace. As long as users do not specify namespaces in their request or cli commands, things should work just as before. 

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