Fix test in PythonRDDSuite

Author: HyukjinKwon

core/src/main/scala/org/apache/spark/security/SocketAuthHelper.scala

@@ -34,7 +34,7 @@ import org.apache.spark.util.Utils
  *
  * There's no secrecy, so this relies on the sockets being either local or somehow encrypted.
  */
-private[spark] class SocketAuthHelper(conf: SparkConf) {
+private[spark] class SocketAuthHelper(val conf: SparkConf) {
 
   val secret = Utils.createSecret(conf)
 

core/src/main/scala/org/apache/spark/security/SocketAuthServer.scala

@@ -51,7 +51,7 @@ private[spark] abstract class SocketAuthServer[T](
     logTrace("Creating listening socket")
     val serverSocket = new ServerSocket(0, 1, InetAddress.getByAddress(Array(127, 0, 0, 1)))
     // Close the socket if no connection in the configured seconds
-    val timeout = SparkEnv.get.conf.get(PYTHON_AUTH_SOCKET_TIMEOUT).toInt
+    val timeout = authHelper.conf.get(PYTHON_AUTH_SOCKET_TIMEOUT).toInt
     logTrace(s"Setting timeout to $timeout sec")
     serverSocket.setSoTimeout(timeout * 1000)