Ensure all files end with a newline

Update all files to ensure that they always end with a new line.

Issue: SPR-16968

spring-test/src/main/java/org/springframework/mock/http/server/reactive/MockServerHttpRequest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2018 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -567,4 +567,4 @@ public class MockServerHttpRequest extends AbstractServerHttpRequest {
 		}
 	}
 
-}
+}

spring-test/src/main/java/org/springframework/test/context/transaction/TransactionContextHolder.java

@@ -47,4 +47,4 @@ class TransactionContextHolder {
 		return transactionContext;
 	}
 
-}
+}

spring-test/src/main/java/org/springframework/test/web/servlet/MockMvcBuilder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2018 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -32,4 +32,4 @@ public interface MockMvcBuilder {
 	 */
 	MockMvc build();
 
-}
+}

spring-test/src/main/java/org/springframework/test/web/servlet/setup/AbstractMockMvcBuilder.java

@@ -158,4 +158,4 @@ public abstract class AbstractMockMvcBuilder<B extends AbstractMockMvcBuilder<B>
 	 */
 	protected abstract WebApplicationContext initWebAppContext();
 
-}
+}