Consistent abstract declaration for utility classes (plus polishing)

Issue: SPR-16968

spring-jdbc/src/main/java/org/springframework/jdbc/config/DatabasePopulatorConfigUtils.java

@@ -38,12 +38,7 @@ import org.springframework.util.xml.DomUtils;
  * @author Stephane Nicoll
  * @since 3.1
  */
-final class DatabasePopulatorConfigUtils {
-
-
-	private DatabasePopulatorConfigUtils() {
-	}
-
+abstract class DatabasePopulatorConfigUtils {
 
 	public static void setDatabasePopulator(Element element, BeanDefinitionBuilder builder) {
 		List<Element> scripts = DomUtils.getChildElementsByTagName(element, "script");

spring-jdbc/src/main/java/org/springframework/jdbc/datasource/embedded/EmbeddedDatabaseConfigurerFactory.java

@@ -29,7 +29,6 @@ import org.springframework.util.Assert;
  */
 final class EmbeddedDatabaseConfigurerFactory {
 
-
 	private EmbeddedDatabaseConfigurerFactory() {
 	}
 

spring-jdbc/src/main/java/org/springframework/jdbc/datasource/embedded/OutputStreamFactory.java

@@ -28,7 +28,6 @@ import java.io.OutputStream;
  */
 public final class OutputStreamFactory {
 
-
 	private OutputStreamFactory() {
 	}