[SPARK-8356][SQL] Reconcile callUDF and callUdf#6902

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BenFradet:SPARK-8356

Commits on Jun 17, 2015

deprecated callUdf in favor of callUDF
BenFradet
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Commits on Jun 19, 2015

reinstated unit test for the deprecated callUdf
BenFradet
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Commits on Jun 22, 2015

deprecated callUDF, use udf instead
BenFradet
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