KIP-789 — Use localhost:9092 as default bootstrap-server/broker-list in client tools

Discussion Admin

KIP-789 proposes making `localhost:9092` the default value for `--bootstrap-server` (and `--broker-list`) in Kafka command-line tools so the parameter can be omitted when connecting to a local broker. Most data system CLI tools (MySQL, ZooKeeper) default to localhost, and requiring `--bootstrap-server` on every invocation adds friction when developing or debugging against a local cluster.

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