Consistent abstract declaration for utility classes (plus polishing)

Issue: SPR-16968

spring-test/src/main/java/org/springframework/test/annotation/TestAnnotationUtils.java

@@ -26,12 +26,7 @@ import org.springframework.core.annotation.AnnotatedElementUtils;
  * @author Sam Brannen
  * @since 4.2
  */
-public final class TestAnnotationUtils {
-
-
-	private TestAnnotationUtils() {
-	}
-
+public abstract class TestAnnotationUtils {
 
 	/**
 	 * Get the {@code timeout} configured via the {@link Timed @Timed}

spring-test/src/main/java/org/springframework/test/jdbc/JdbcTestUtils.java

@@ -38,15 +38,11 @@ import org.springframework.util.StringUtils;
  * @see org.springframework.jdbc.datasource.init.ResourceDatabasePopulator
  * @see org.springframework.jdbc.datasource.init.DatabasePopulatorUtils
  */
-public final class JdbcTestUtils {
+public abstract class JdbcTestUtils {
 
 	private static final Log logger = LogFactory.getLog(JdbcTestUtils.class);
 
 
-	private JdbcTestUtils() {
-	}
-
-
 	/**
 	 * Count the rows in the given table.
 	 * @param jdbcTemplate the JdbcTemplate with which to perform JDBC operations

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

@@ -35,7 +35,6 @@ import org.springframework.web.context.WebApplicationContext;
  */
 public final class MockMvcBuilders {
 
-
 	private MockMvcBuilders() {
 	}