[SPARK-19862] 'tungsten-sort' should be deleted in SparkEnv.scala#17220

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guoxiaolongzte wants to merge 1 commit intoapache:masterfrom

guoxiaolongzte:SPARK-19862

Commits on Mar 9, 2017

remove tungsten-sort.Because it is not represent 'org.apache.spark.shuffle.unsafe.UnsafeShuffleManager'.
郭小龙 10207633
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