KAFKA-18388: test-kraft-server-start.sh should use log4j2.yaml

[FrankYang0529]

Run script and can see logs:

> cd raft
> bin/test-kraft-server-start.sh --config config/kraft.properties --replica-directory-id b8tRS7h4TJ2Vt43Dp85v2A
[2025-01-01 23:04:08,112] INFO Registered kafka:type=kafka.Log4jController MBean (kafka.utils.Log4jControllerRegistration$)
[2025-01-01 23:04:08,182] INFO Setting -D jdk.tls.rejectClientInitiatedRenegotiation=true to disable client-initiated TLS renegotiation (org.apache.zookeeper.common.X509Util)
[2025-01-01 23:04:08,363] INFO Updated connection-accept-rate max connection creation rate to 2147483647 (kafka.network.ConnectionQuotas)
...

Committer Checklist (excluded from commit message)

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

[chia7712]

@FrankYang0529 could you please test log4j properties also? It should work with some deprecation warnings

[FrankYang0529]

could you please test log4j properties also? It should work with some deprecation warnings

Yes, it works as well.

1. Set up raft/config/kraft-log4j.properties.

log4j.rootLogger=INFO, stderr

log4j.appender.stderr=org.apache.log4j.ConsoleAppender
log4j.appender.stderr.layout=org.apache.log4j.PatternLayout
log4j.appender.stderr.layout.ConversionPattern=[%d] %p %m (%c)%n
log4j.appender.stderr.Target=System.err

log4j.logger.org.apache.kafka.raft=INFO
log4j.logger.org.apache.kafka.snapshot=INFO

2. Run test-kraft-server-start.sh.

> cd raft
> KAFKA_LOG4J_OPTS="-Dlog4j.configuration=file:config/kraft-log4j.properties" bin/test-kraft-server-start.sh --config config/kraft.properties --replica-directory-id b8tRS7h4TJ2Vt43Dp85v2A
-Dlog4j.configuration=file:config/kraft-log4j.properties
DEPRECATED: A Log4j 1.x configuration file has been detected, which is no longer recommended.
To use a Log4j 2.x configuration, please see https://logging.apache.org/log4j/2.x/migrate-from-log4j1.html#Log4j2ConfigurationFormat for details about Log4j configuration file migration.
You can also use the $KAFKA_HOME/config/tools-log4j2.yaml file as a starting point. Make sure to remove the Log4j 1.x configuration after completing the migration.
[2025-01-05 11:18:55,187] INFO Registered kafka:type=kafka.Log4jController MBean (kafka.utils.Log4jControllerRegistration$)
[2025-01-05 11:18:55,272] INFO Setting -D jdk.tls.rejectClientInitiatedRenegotiation=true to disable client-initiated TLS renegotiation (org.apache.zookeeper.common.X509Util)
...