Flaky test: BarrierStageOnSubmittedSuite."submit a barrier ResultStage that requires more slots than current total under local-cluster mode"

[info] - submit a barrier ResultStage that requires more slots than current total under local-cluster mode *** FAILED *** (5 seconds, 303 milliseconds)
[info]   Expected exception org.apache.spark.SparkException to be thrown, but java.util.concurrent.TimeoutException was thrown (BarrierStageOnSubmittedSuite.scala:54)
[info]   org.scalatest.exceptions.TestFailedException:
[info]   at org.scalatest.Assertions$class.newAssertionFailedException(Assertions.scala:528)
[info]   at org.scalatest.FunSuite.newAssertionFailedException(FunSuite.scala:1560)
[info]   at org.scalatest.Assertions$class.intercept(Assertions.scala:812)
[info]   at org.scalatest.FunSuite.intercept(FunSuite.scala:1560)
[info]   at org.apache.spark.BarrierStageOnSubmittedSuite.org$apache$spark$BarrierStageOnSubmittedSuite$$testSubmitJob(BarrierStageOnSubmittedSuite.scala:54)
[info]   at org.apache.spark.BarrierStageOnSubmittedSuite$$anonfun$18.apply$mcV$sp(BarrierStageOnSubmittedSuite.scala:240)
[info]   at org.apache.spark.BarrierStageOnSubmittedSuite$$anonfun$18.apply(BarrierStageOnSubmittedSuite.scala:227)
[info]   at org.apache.spark.BarrierStageOnSubmittedSuite$$anonfun$18.apply(BarrierStageOnSubmittedSuite.scala:227)