momo

Results 6 issues of momo

distributed deadlock happen scenes: ![image](https://user-images.githubusercontent.com/73138/168739054-14f72fe9-7337-4461-8965-45edc6be3009.png)

By configuring `max_rate_limit` in user properties, achieve the effect of flow control 。Detail config as following: ``` "users": [ { "user_name": "**", "password": "***", "namespace": "sysbench_4", "rw_flag": 2, "rw_split": 1,...

support multi-query like that: `set autocommit=0;select ....;insert...;update.....;set .....;`