[SPARK-21728][core] Follow up: fix user config, auth in SparkSubmit logging. #19089
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SecurityManager complains when auth is enabled but no secret is defined;
SparkSubmit doesn't use the auth functionality of the SecurityManager,
so use a dummy secret to work around the exception.
Only reset the log4j configuration when Spark was the one initializing
it, otherwise user-defined log configuration may be lost.
Tested with the log config file posted to the bug, on a secured YARN cluster.