optimize: DNS获取到的IP，如果测速未通过，则不使用该IP，直接使用域名发起请求。 #333
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Ⅰ. 描述此PR的作用：
代理连接超时时，未关闭客户端socket连接的问题。dns-lookup代码封装并优化日志，使connect和request复用dns-lookup的代码。Ⅱ. 此PR修复了哪个issue吗？
fixes #308