[SPARK-19646][CORE][STREAMING] binaryRecords replicates records in scala API#16974

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Commits on Feb 17, 2017

Use BytesWritable.copyBytes, not getBytes, because getBytes returns the underlying array, which may be reused when repeated reads don't need a different size, as is the case with binaryRecords APIs
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Add tests for fix, and improve surrounding test code
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