Synthesize annotation from defaults

This commit introduces a convenience method in AnnotationUtils for
synthesizing an annotation from its default attribute values.

TransactionalTestExecutionListener has been refactored to invoke this
new convenience method.

Issue: SPR-13087

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

@@ -135,7 +135,7 @@ public class TransactionalTestExecutionListener extends AbstractTestExecutionLis
 	private static final Log logger = LogFactory.getLog(TransactionalTestExecutionListener.class);
 
 	private static final TransactionConfiguration defaultTransactionConfiguration =
-			AnnotationUtils.synthesizeAnnotation(Collections.<String, Object> emptyMap(), TransactionConfiguration.class, null);
+			AnnotationUtils.synthesizeAnnotation(TransactionConfiguration.class);
 
 	protected final TransactionAttributeSource attributeSource = new AnnotationTransactionAttributeSource();