Write information about restart in .result

Idea comes from MySQL which does something similar

mysql-test/suite/innodb/r/innodb_bug68148.result

@@ -19,6 +19,7 @@ main
 ref_table1
 ref_table2
 # restart and see if we can still access the main table
+# restart
 SET FOREIGN_KEY_CHECKS=0;
 ALTER TABLE `main` ADD INDEX `idx_1` (`ref_id1`);
 SHOW CREATE TABLE `main`;