[FLINK-17618][flink-dist] Update the outdated comments in log4j2 configuration files

[wangyang0918]

When we upgrade the log4j to log4j2, there are some residual log4j logger configuration in the comments. Just like following,

log4j.properties and log4j-console.properties

# Uncomment this if you want to _only_ change Flink's logging
#log4j.logger.org.apache.flink=INFO

We should update them to the log4j2 format.

# Uncomment this if you want to _only_ change Flink's logging
logger.flink.name = org.apache.flink
logger.flink.level = INFO

[wangyang0918]

cc @zentol Could you have a look? When i update the flink-console.sh, i find this issue.

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