Fix test cases to preserve the state that existed before the

test case was executed.

mysql-test/r/concurrent_innodb_safelog.result

@@ -801,3 +801,4 @@ eta	tipo	c
 90	11	kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk
 ** connection default
 drop table t1;
+drop user mysqltest@localhost;