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Based on Brahma's comment in HADOOP-14296, it's better to use GenericTestUtils.setLogLevel as possible to make the migration easier.
Based on Akira Ajisaka's comment in HADOOP-14549, create a separate jira for hadoop-common change.
Use GenericTestUtils.setLogLevel when available in hadoop-tools
Move log4j APIs over to slf4j in hadoop-common
Move commons logging APIs over to slf4j in hadoop-common