RandomSampleLoader does not handle skipping correctly in getNext()

                 Key: PIG-649
                 URL: https://issues.apache.org/jira/browse/PIG-649
             Project: Pig
          Issue Type: Bug
    Affects Versions: types_branch
            Reporter: Pradeep Kamath
            Assignee: Pradeep Kamath
             Fix For: types_branch

Currently RandomSampleLoader calls skip() on the underlying input stream 
(BufferedPositionedInputStream) in its getNext(). The input stream may not 
actually skip over the amount the RandomSampleLoader needs in one call. 
RandomSampleLoader should check the return value from the skip() call and 
ensure that skip() is called repeatedly (if necessary) till the needed number 
of bytes are skipped.

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