Removes remote debugging stuff

Author: liancheng

project/SparkBuild.scala

@@ -548,7 +548,6 @@ object TestSettings {
     javaOptions in Test += "-Dspark.driver.allowMultipleContexts=true",
     javaOptions in Test += "-Dspark.unsafe.exceptionOnMemoryLeak=true",
     javaOptions in Test += "-Dsun.io.serialization.extendedDebugInfo=true",
-    javaOptions in Test += "-agentlib:jdwp=transport=dt_socket,server=n,address=127.0.0.1:5005",
     javaOptions in Test ++= System.getProperties.filter(_._1 startsWith "spark")
       .map { case (k,v) => s"-D$k=$v" }.toSeq,
     javaOptions in Test += "-ea",