KIP-676 — Respect logging hierarchy

Accepted Kafka 2.8 Admin

KIP-676 fixes the `AlterClientQuotas` API and `kafka-configs.sh` to honor Log4j's logger hierarchy when dynamically setting log levels, so that setting a parent logger's level also applies to all child loggers as Log4j intends. Previously, the broker stored and applied only the explicitly named logger, silently ignoring hierarchy and forcing operators to enumerate every child logger individually.

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