HADOOP-10588. Workaround for jetty6 acceptor startup issue. Contributed by Kihwal Lee.

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HDFS-6361. Merging change r1595050 from trunk

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

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HDFS-4052. Merge r1398631 from trunk to branch-2.

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HDFS-6362. Merge r1595056 from trunk to branch-2.

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HDFS-6402. Merging change r1595070 from trunk to branch-2.

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HDFS-6345. DFS.listCacheDirectives() should allow filtering based on cache directive ID. (wang)

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