MAPREDUCE-3310. Addendum fixing javadocs warnings (tucu)

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HDFS-2832. Merge r1550363 from trunk for merging HDFS Heterogeneous Storage feature phase 1.

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HDFS-5454. Merge r1551296 from trunk to branch-2.

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HDFS-5406. Merge r1551093 and r1551110 from trunk to branch-2

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HDFS-5406. Update CHANGES.txt

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HDFS-5667. Merge r1555929 and r1555956 from trunk to branch-2.

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YARN-1029. Added embedded leader election in the ResourceManager. Contributed by Karthik Kambatla.
svn merge --ignore-ancestry -c 1556103 ../../trunk/


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