[SPARK-5969][PySpark] Fix descending pyspark.rdd.sortByKey.#4761

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foxik wants to merge 2 commits intoapache:masterfrom

foxik:fix-descending-sort

Commits on Feb 25, 2015

Fix descending pyspark.rdd.sortByKey.
foxik
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Commits on Mar 6, 2015

Add regression test for SPARK-5969.
foxik
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