[SPARK-4688] Have a single shared network timeout in Spark

[SPARK-4688] Have a single shared network timeout in Spark
I am not sure what you mean here. You mean I should change the statement to "This config will be used around spark.core.connection.ack.wait.timeout, spark.akka.timeout, spark.storage.blockManagerSlaveTimeoutMs and spark.shuffle.io.connectionTimeout, if they are not configured." ?