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kafka-topics will be modified to add support for moving a topic from one namespace to another namespace, as shown below.

kafka-topics.sh --zookeeper <ZK_CONNECTION_STRING> --move --from-namespace <NAMESPACE> --to-namespace <NAMESPACE>

Changes in Storage Layouts

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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. 

Handling Rolling Upgrade

We need a way to be able to stop users from creating a namespace after upgrading a subset of brokers, not all brokers. This will lead to inconsistent behavior. I do not have any suggestion on this

Handling Acls Inheritance

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