Fix ReplSuite.

Author: Marcelo Vanzin

repl/scala-2.11/src/test/scala/org/apache/spark/repl/ReplSuite.scala

@@ -48,8 +48,8 @@ class ReplSuite extends SparkFunSuite {
     val oldExecutorClasspath = System.getProperty(CONF_EXECUTOR_CLASSPATH)
     System.setProperty(CONF_EXECUTOR_CLASSPATH, classpath)
 
-    System.setProperty("spark.master", master)
-      Main.doMain(Array("-classpath", classpath), new SparkILoop(in, new PrintWriter(out)))
+    Main.conf.set("spark.master", master)
+    Main.doMain(Array("-classpath", classpath), new SparkILoop(in, new PrintWriter(out)))
 
     if (oldExecutorClasspath != null) {
       System.setProperty(CONF_EXECUTOR_CLASSPATH, oldExecutorClasspath)