SPARK-1316. Remove use of Commons IO

(This follows from a side point on SPARK-1133, in discussion of the PR: https://github.com/apache/spark/pull/164 )

Commons IO is barely used in the project, and can easily be replaced with equivalent calls to Guava or the existing Spark `Utils.scala` class.

Removing a dependency feels good, and this one in particular can get a little problematic since Hadoop uses it too.

Author: Sean Owen <sowen@cloudera.com>

Closes #226 from srowen/SPARK-1316 and squashes the following commits:

21efef3 [Sean Owen] Remove use of Commons IO

1 files changed, 3 insertions, 3 deletions

diff --git a/streaming/src/main/scala/org/apache/spark/streaming/util/MasterFailureTest.scala b/streaming/src/main/scala/org/apache/spark/streaming/util/MasterFailureTest.scala
index 2bb616cfb8..c48a38590e 100644
--- a/streaming/src/main/scala/org/apache/spark/streaming/util/MasterFailureTest.scala
+++ b/streaming/src/main/scala/org/apache/spark/streaming/util/MasterFailureTest.scala
@@ -28,12 +28,12 @@ import scala.collection.mutable.{SynchronizedBuffer, ArrayBuffer}
 import scala.reflect.ClassTag
 
 import java.io.{File, ObjectInputStream, IOException}
+import java.nio.charset.Charset
 import java.util.UUID
 
 import com.google.common.io.Files
 
-import org.apache.commons.io.FileUtils
-import org.apache.hadoop.fs.{FileUtil, FileSystem, Path}
+import org.apache.hadoop.fs.Path
 import org.apache.hadoop.conf.Configuration
 
 
@@ -389,7 +389,7 @@ class FileGeneratingThread(input: Seq[String], testDir: Path, interval: Long)
         val localFile = new File(localTestDir, (i + 1).toString)
         val hadoopFile = new Path(testDir, (i + 1).toString)
         val tempHadoopFile = new Path(testDir, ".tmp_" + (i + 1).toString)
-        FileUtils.writeStringToFile(localFile, input(i).toString + "\n")
+        Files.write(input(i) + "\n", localFile, Charset.forName("UTF-8"))
         var tries = 0
         var done = false
             while (!done && tries < maxTries) {