Minor formatting fixes.

Author: harishreedharan

core/src/main/scala/org/apache/spark/deploy/SparkHadoopUtil.scala

@@ -297,7 +297,7 @@ class SparkHadoopUtil extends Logging {
    * Start a thread to periodically update the current user's credentials with new delegation
    * tokens so that writes to HDFS do not fail.
    */
-  private[spark] def startExecutorDelegationTokenRenewer(conf: SparkConf){}
+  private[spark] def startExecutorDelegationTokenRenewer(conf: SparkConf) {}
 
   /**
    * Stop the thread that does the delegation token updates.

yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnSparkHadoopUtil.scala

@@ -132,7 +132,7 @@ class YarnSparkHadoopUtil extends SparkHadoopUtil {
     tokenRenewer.get.updateCredentialsIfRequired()
   }
 
-  private[spark] override def stopExecutorDelegationTokenRenewer(): Unit ={
+  private[spark] override def stopExecutorDelegationTokenRenewer(): Unit = {
     tokenRenewer.foreach(_.stop())
   }