KIP-308 — Support dynamic update of max.connections.per.ip/max.connections.per.ip.overrides configs

Accepted Kafka 2.1 BrokerAdmin

Extends the KIP-226 dynamic broker configuration framework to include `max.connections.per.ip` and `max.connections.per.ip.overrides`, making them hot-reloadable via `kafka-configs.sh` without a broker restart. Without dynamic support, mitigating a misbehaving client that exhausts connections from a specific IP requires a disruptive broker restart.

Details