svn merge -c 1510581 Merging from trunk to branch-2 to fix MAPREDUCE-5446. TestJobHistoryEvents and TestJobHistoryParsing have race conditions.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1510583 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5367. Local jobs all use same local working directory (Sandy Ryza)

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HDFS-5061. Merge 1510611 from trunk

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move HDFS-4962,HDFS-5043 to the right section in hadoop-hdfs/CHANGES.txt

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move HADOOP-9806 to the right section in hadoop-common/CHANGES.txt

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HADOOP-9319. Update bundled LZ4 source to r99. (Binglin Chang via llu)

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