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JUnit 4.11 has been out for a while; other projects are happy with it, so update it.
TestPipeApplication causing nightly build to fail
Jenkins test-patch timed out on a large patch touching files in multiple modules.
Prepare HDFS codebase for JUnit 4.11.
Prepare MapReduce codebase for JUnit 4.11.
Prepare YARN codebase for JUnit 4.11.