Change flag name

Author: shivaram

core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala

@@ -138,7 +138,7 @@ class DAGScheduler(
   taskScheduler.setDAGScheduler(this)
 
   // Flag to control if reduce tasks are assigned preferred locations
-  private val shuffleLocalityEnabled = sc.getConf.getBoolean("spark.shuffle.locality.enabled", true)
+  private val shuffleLocalityEnabled = sc.getConf.getBoolean("spark.shuffle.reduceLocality.enabled", true)
   // Number of map, reduce tasks above which we do not assign preferred locations
   // based on map output sizes. We limit the size of jobs for which assign preferred locations
   // as sorting the locations by size becomes expensive.