flaky test: run Python application in yarn-cluster mode

Process List(/home/jenkins/workspace/Spark-Master-SBT/AMPLAB_JENKINS_BUILD_PROFILE/hadoop2.3/label/centos/bin/spark-submit, --master, yarn-cluster, --num-executors, 1, --properties-file, /tmp/spark-451f65e7-8e13-404f-ae7a-12a0d0394f09/spark3554401802242467930.properties, --py-files, /tmp/spark-451f65e7-8e13-404f-ae7a-12a0d0394f09/test2.py, /tmp/spark-451f65e7-8e13-404f-ae7a-12a0d0394f09/test.py, /tmp/spark-451f65e7-8e13-404f-ae7a-12a0d0394f09/result8930129095246825990.tmp) exited with code 1
Stacktrace

sbt.ForkMain$ForkError: Process List(/home/jenkins/workspace/Spark-Master-SBT/AMPLAB_JENKINS_BUILD_PROFILE/hadoop2.3/label/centos/bin/spark-submit, --master, yarn-cluster, --num-executors, 1, --properties-file, /tmp/spark-451f65e7-8e13-404f-ae7a-12a0d0394f09/spark3554401802242467930.properties, --py-files, /tmp/spark-451f65e7-8e13-404f-ae7a-12a0d0394f09/test2.py, /tmp/spark-451f65e7-8e13-404f-ae7a-12a0d0394f09/test.py, /tmp/spark-451f65e7-8e13-404f-ae7a-12a0d0394f09/result8930129095246825990.tmp) exited with code 1
	at org.apache.spark.util.Utils$.executeAndGetOutput(Utils.scala:1122)
	at org.apache.spark.deploy.yarn.YarnClusterSuite.org$apache$spark$deploy$yarn$YarnClusterSuite$$runSpark(YarnClusterSuite.scala:259)
	at org.apache.spark.deploy.yarn.YarnClusterSuite$$anonfun$4.apply$mcV$sp(YarnClusterSuite.scala:160)
	at org.apache.spark.deploy.yarn.YarnClusterSuite$$anonfun$4.apply(YarnClusterSuite.scala:146)
	at org.apache.spark.deploy.yarn.YarnClusterSuite$$anonfun$4.apply(YarnClusterSuite.scala:146)
	at org.scalatest.Transformer$$anonfun$apply$1.apply$mcV$sp(Transformer.scala:22)
	at org.scalatest.OutcomeOf$class.outcomeOf(OutcomeOf.scala:85)
	at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104)
	at org.scalatest.Transformer.apply(Transformer.scala:22)
	at org.scalatest.Transformer.apply(Transformer.scala:20)
	at org.scalatest.FunSuiteLike$$anon$1.apply(FunSuiteLike.scala:166)
	at org.scalatest.Suite$class.withFixture(Suite.scala:1122)
	at org.scalatest.FunSuite.withFixture(FunSuite.scala:1555)
	at org.scalatest.FunSuiteLike$class.invokeWithFixture$1(FunSuiteLike.scala:163)
	at org.scalatest.FunSuiteLike$$anonfun$runTest$1.apply(FunSuiteLike.scala:175)
	at org.scalatest.FunSuiteLike$$anonfun$runTest$1.apply(FunSuiteLike.scala:175)
	at org.scalatest.SuperEngine.runTestImpl(Engine.scala:306)
	at org.scalatest.FunSuiteLike$class.runTest(FunSuiteLike.scala:175)
	at org.scalatest.FunSuite.runTest(FunSuite.scala:1555)
	at org.scalatest.FunSuiteLike$$anonfun$runTests$1.apply(FunSuiteLike.scala:208)
	at org.scalatest.FunSuiteLike$$anonfun$runTests$1.apply(FunSuiteLike.scala:208)
	at org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:413)
	at org.scalatest.SuperEngine$$anonfun$traverseSubNodes$1$1.apply(Engine.scala:401)
	at scala.collection.immutable.List.foreach(List.scala:318)
	at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:401)
	at org.scalatest.SuperEngine.org$scalatest$SuperEngine$$runTestsInBranch(Engine.scala:396)
	at org.scalatest.SuperEngine.runTestsImpl(Engine.scala:483)
	at org.scalatest.FunSuiteLike$class.runTests(FunSuiteLike.scala:208)
	at org.scalatest.FunSuite.runTests(FunSuite.scala:1555)
	at org.scalatest.Suite$class.run(Suite.scala:1424)
	at org.scalatest.FunSuite.org$scalatest$FunSuiteLike$$super$run(FunSuite.scala:1555)
	at org.scalatest.FunSuiteLike$$anonfun$run$1.apply(FunSuiteLike.scala:212)
	at org.scalatest.FunSuiteLike$$anonfun$run$1.apply(FunSuiteLike.scala:212)
	at org.scalatest.SuperEngine.runImpl(Engine.scala:545)
	at org.scalatest.FunSuiteLike$class.run(FunSuiteLike.scala:212)
	at org.apache.spark.deploy.yarn.YarnClusterSuite.org$scalatest$BeforeAndAfterAll$$super$run(YarnClusterSuite.scala:44)
	at org.scalatest.BeforeAndAfterAll$class.liftedTree1$1(BeforeAndAfterAll.scala:257)
	at org.scalatest.BeforeAndAfterAll$class.run(BeforeAndAfterAll.scala:256)
	at org.apache.spark.deploy.yarn.YarnClusterSuite.run(YarnClusterSuite.scala:44)
	at org.scalatest.tools.Framework.org$scalatest$tools$Framework$$runSuite(Framework.scala:462)
	at org.scalatest.tools.Framework$ScalaTestTask.execute(Framework.scala:671)
	at sbt.ForkMain$Run$2.call(ForkMain.java:294)
	at sbt.ForkMain$Run$2.call(ForkMain.java:284)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)