add # for cron pattern that can ignore seconds, which makes the cron pattern running in minimum minute like linux crontab pattern (#3306)

example/trace/grpc-with-db/sql.sql

@@ -0,0 +1,6 @@
+DROP TABLE IF EXISTS `user`;
+CREATE TABLE `user` (
+    `uid` int(10) unsigned NOT NULL AUTO_INCREMENT,
+    `name` varchar(45) NOT NULL,
+    PRIMARY KEY (`uid`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8;