Introduce an iterator over blocks in the block report array.
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                 Key: HDFS-581
                 URL: https://issues.apache.org/jira/browse/HDFS-581
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: name-node
    Affects Versions: 0.20.1
            Reporter: Konstantin Shvachko
            Assignee: Konstantin Shvachko
             Fix For: 0.21.0


A block iterator will hide the internal implementation of the block report as 
an array of three longs per block.

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