MDEV-12237 main.analyze_stmt_slow_query_log failed in buildbot

Author: vuvova

mysql-test/main/analyze_stmt_slow_query_log.result

@@ -10,6 +10,7 @@ a
 1
 2
 drop table t1;
+FLUSH SLOW LOGS;
 # explain: id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra
 # explain: 1	INSERT	t1	ALL	NULL	NULL	NULL	NULL	NULL	NULL	100.00	100.00	NULL
 # explain: id	select_type	table	type	possible_keys	key	key_len	ref	rows	r_rows	filtered	r_filtered	Extra

mysql-test/main/analyze_stmt_slow_query_log.test

@@ -26,6 +26,7 @@ select * from t1 where a<3;
 --enable_cursor_protocol
 drop table t1;
 let SLOW_LOG_FILE= `select @@slow_query_log_file`;
+FLUSH SLOW LOGS;
 
 # select @@slow_query_log_file;