HDFS-6361. TestIdUserGroup.testUserUpdateSetting failed due to out of range nfsnobody Id. Contributed by Yongjun Zhang

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HDFS-5683. Better audit log messages for caching operations. Contributed by Abhiraj Butala.

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HDFS-6362. InvalidateBlocks is inconsistent in usage of DatanodeUuid and StorageID. (Arpit Agarwal)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1595056 13f79535-47bb-0310-9956-ffa450edef68