HDFS-2976. Move attribution to release 2.6.0 section in CHANGES.txt.

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HADOOP-8158. Move attribution to release 2.6.0 section in CHANGES.txt.

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HDFS-3851. Move attribution to release 2.6.0 section in CHANGES.txt.

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HADOOP-10736. Add key attributes to the key shell. Contributed by Mike Yoder.

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