feat: set error response for timeout request

[wangshao1]

之前的codis proxy 中，如果后端服务读请求超时，对应链接会close重新创建新链接，对应链接上的请求会直接失败。
修改之后，如果请求超时，只会将对应的request设置为err，不会kill链接。

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[YuCai18]

这里应该先处理当前响应，再减少timeout计数。过早的continue会导致即使后续请求成功，客户端也无法收到响应结果。