Remove extendedDebugInfo option in test build settings.

From this [commit][1], `SparkBuild.scala` add a new javaOptions `-Dsun.io.serialization.extendedDebugInfo=true` in Test. This make `org.apache.spark.streaming.InputStreamsSuite` failed.


[1]: https://github.com/apache/spark/commit/accd0999f9cb6a449434d3fc5274dd469eeecab2