Preparing for hadoop-2.1.0-beta rc2.

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HDFS-5076. Merge change r1514429 from branch-2.

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Release notes for hadoop-2.1.0-beta rc2

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HDFS-5099. Merging change r1514484 from branch-2 to branch-2.1-beta.

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HDFS-2994. If lease soft limit is recovered successfully the append can fail. Contributed by Tao Luo.

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