AclClassIdUtils should be public

Fixes gh-4814

acl/src/main/java/org/springframework/security/acls/jdbc/AclClassIdUtils.java

@@ -29,7 +29,7 @@ import org.springframework.security.acls.model.ObjectIdentity;
  * the correct Java type as specified by <code>acl_class.class_id_type</code>.
  * @author paulwheeler
  */
-class AclClassIdUtils {
+public class AclClassIdUtils {
 	private static final String DEFAULT_CLASS_ID_TYPE_COLUMN_NAME = "class_id_type";
 	private static final Log log = LogFactory.getLog(AclClassIdUtils.class);