[HOTFIX] [SQL] Fix compilation for scala 2.11.

Author: Prashant Sharma <prashant.s@imaginea.com>

Closes #5652 from ScrapCodes/hf/compilation-fix-scala-2.11 and squashes the following commits:

819ff06 [Prashant Sharma] [HOTFIX] Fix compilation for scala 2.11.

sql/core/src/test/java/test/org/apache/spark/sql/JavaDataFrameSuite.java

@@ -162,7 +162,7 @@ public class JavaDataFrameSuite {
     Buffer<Integer> outputBuffer = (Buffer<Integer>) first.getJavaMap(2).get("hello");
     Assert.assertArrayEquals(
       bean.getC().get("hello"),
-      Ints.toArray(JavaConversions.asJavaList(outputBuffer)));
+      Ints.toArray(JavaConversions.bufferAsJavaList(outputBuffer)));
     Seq<String> d = first.getAs(3);
     Assert.assertEquals(bean.getD().size(), d.length());
     for (int i = 0; i < d.length(); i++) {