OrderServer回滚，StorageServer没有回滚

**前提**
seata-server部署在windows上(db模式)，使用[springcloud-eureka-feign-mybatis-seata demo](https://github.com/seata/seata-samples/tree/master/springcloud-eureka-feign-mybatis-seata)，在StorageServer.decrease添加Thread.sleep(2000)模拟请求超时。使用jmeter，开启10个线程，每个线程调用2遍OrderServer order/create接口。

**现象**
由于超时order表全部回滚，没有产生数据（正常）
storage表出现出现扣库存（异常）
branch_table，lock_table，undo_log 都有一行数据，表明事务没正常回滚（异常）
global_table 表为空。
可多次复现。

Reproduce the issue with the springcloud-eureka-feign-mybatis-seata demo, deploying seata-server on Windows in db mode. Start by inspecting StorageServer.decrease and the transaction state in order, storage, branch_table, lock_table, undo_log, and global_table while running the described JMeter load. Done means timed-out requests roll back storage changes and leave no stale transaction rows.

Written by the indexing model from the issue text.