Various whitespace changes (minor)

Author: Andrew Or

core/src/test/scala/org/apache/spark/ExecutorAllocationManagerSuite.scala

@@ -32,6 +32,7 @@ class ExecutorAllocationManagerSuite
   extends SparkFunSuite
   with LocalSparkContext
   with BeforeAndAfter {
+
   import ExecutorAllocationManager._
   import ExecutorAllocationManagerSuite._
 

core/src/test/scala/org/apache/spark/deploy/SparkSubmitSuite.scala

@@ -39,6 +39,7 @@ class SparkSubmitSuite
   with Matchers
   with ResetSystemProperties
   with Timeouts {
+
   def beforeAll() {
     System.setProperty("spark.testing", "true")
   }

core/src/test/scala/org/apache/spark/network/netty/NettyBlockTransferServiceSuite.scala

@@ -26,6 +26,7 @@ class NettyBlockTransferServiceSuite
   extends SparkFunSuite
   with BeforeAndAfterEach
   with ShouldMatchers {
+
   private var service0: NettyBlockTransferService = _
   private var service1: NettyBlockTransferService = _
 

core/src/test/scala/org/apache/spark/util/SizeEstimatorSuite.scala

@@ -57,7 +57,6 @@ class DummyString(val arr: Array[Char]) {
 }
 
 class SizeEstimatorSuite
- 
   extends SparkFunSuite
   with BeforeAndAfterEach
   with PrivateMethodTester