Merge pull request #544 from kayousterhout/fix_test_warnings. Closes #544.

Fixed warnings in test compilation.

This commit fixes two problems: a redundant import, and a
deprecated function.

Author: Kay Ousterhout <kayousterhout@gmail.com>

== Merge branch commits ==

commit da9d2e13ee4102bc58888df0559c65cb26232a82
Author: Kay Ousterhout <kayousterhout@gmail.com>
Date:   Wed Feb 5 11:41:51 2014 -0800

    Fixed warnings in test compilation.

    This commit fixes two problems: a redundant import, and a
    deprecated function.

core/src/test/scala/org/apache/spark/api/python/PythonRDDSuite.scala

@@ -19,7 +19,6 @@ package org.apache.spark.api.python
 
 import org.scalatest.FunSuite
 import org.scalatest.matchers.ShouldMatchers
-import org.apache.spark.api.python.PythonRDD
 
 import java.io.{ByteArrayOutputStream, DataOutputStream}
 

core/src/test/scala/org/apache/spark/rdd/RDDSuite.scala

@@ -48,7 +48,7 @@ class RDDSuite extends FunSuite with SharedSparkContext {
     val partitionSums = nums.mapPartitions(iter => Iterator(iter.reduceLeft(_ + _)))
     assert(partitionSums.collect().toList === List(3, 7))
 
-    val partitionSumsWithSplit = nums.mapPartitionsWithSplit {
+    val partitionSumsWithSplit = nums.mapPartitionsWithIndex {
       case(split, iter) => Iterator((split, iter.reduceLeft(_ + _)))
     }
     assert(partitionSumsWithSplit.collect().toList === List((0, 3), (1, 7)))