Timer cancellation is not reliable

We detect whether the timer was canceled in ad-hoc ways.
Especially, if a lock is involved, the situation is not desirable.
This commit addresses that: https://github.com/CodeChain-io/codechain/commit/96f7f942f3021b4154a5da14bbd7680c1e080200

We need a regular mechanism to know fired timeout is canceled, not by ad-hoc devised ways if we can't control it.

首先检查提交 96f7f942f3021b4154a5da14bbd7680c1e080200，并跟踪它所修改的计时器取消路径。该 issue 未提供文件名或测试名称；当常规机制能够可靠地确定已触发的 timeout 是否已被取消（包括涉及 lock 的情况）时，即视为完成。

由索引模型根据 Issue 内容生成。