KAFKA-18059: kafka-metadata-quorum.sh add-controller subcommand can't recognize argument --config

[FrankYang0529]

In KIP-853, it uses following command as adding controller example.

kafka-metadata-quorum --bootstrap-server <endpoints> add-controller --config controller.properties

The script returns "kafka-metadata-quorum: error: unrecognized arguments: '--config'". The correct way to add controller is like following:

kafka-metadata-quorum --bootstrap-server <endpoints> --command-config controller.properties add-controller

From @chia7712's suggestion, we keep using --command-config to avoid breaking change. However, in MetadataQuorumCommand, the --command-config description is "Property file containing configs to be passed to Admin Client.". We should update the description to mention it's also used as controller property file for add-controller command.

Committer Checklist (excluded from commit message)

• Verify design and implementation
• Verify test coverage and CI build status
• Verify documentation (including upgrade notes)

[chia7712]

LGTM