Add a capability to use of consistent checksums for append and copy
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                 Key: HADOOP-8060
                 URL: https://issues.apache.org/jira/browse/HADOOP-8060
             Project: Hadoop Common
          Issue Type: Bug
          Components: fs, util
    Affects Versions: 0.23.0, 0.24.0, 0.23.1
            Reporter: Kihwal Lee
            Assignee: Kihwal Lee
             Fix For: 0.24.0, 0.23.2


After the improved CRC32C checksum feature became default, some of use cases 
involving data movement are no longer supported.  For example, when running 
DistCp to copy from a file stored with the CRC32 checksum to a new cluster with 
the CRC32C set to default checksum, the final data integrity check fails 
because of mismatch in checksums.

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