MAPREDUCE-4899 fix branch-2 merge issue in pom

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HDFS-4100. Fix all findbug security warings. Contributed by Liang Xie


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HDFS-4030. BlockManager excessBlocksCount and postponedMisreplicatedBlocksCount should be AtomicLongs. Contributed by Eli Collins


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HDFS-4031. Update findbugsExcludeFile.xml to include findbugs 2 exclusions. Contributed by Eli Collins


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HDFS-4033. Miscellaneous findbugs 2 fixes. Contributed by Eli Collins


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HDFS-4034. Remove redundant null checks. Contributed by Eli Collins


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HDFS-4362. Merging change r1430137 from trunk.

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HDFS-4035. LightWeightGSet and LightWeightHashSet increment a volatile without synchronization. Contributed by Eli Collins


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