Distcp should support verification modes
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                 Key: HADOOP-1532
                 URL: https://issues.apache.org/jira/browse/HADOOP-1532
             Project: Hadoop
          Issue Type: New Feature
          Components: util
            Reporter: Senthil Subramanian
             Fix For: 0.14.0


distcp doesnot currently support any verification after copying files. It 
should support 
1. verify quick (vq) mode - which compares the source and destination CRCs
2. verify long (vl) mode - which in addition to verify quick should read the 
entire destination file to catch DFS block level errors

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