svn merge -c 1575049 from trunk for MAPREDUCE-5780. SliveTest should use the specified path to get the particular FileSystem instead of using the default FileSystem.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1575055 13f79535-47bb-0310-9956-ffa450edef68
Merge r1575086 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1575088 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6067. TestPread.testMaxOutHedgedReadPool is flaky (cmccabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1575101 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6065. HDFS zero-copy reads should return null on EOF when doing ZCR (cmccabe)

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