fix: atexit destroy default logger multithreading env bug #783
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遇到HttpServer loop_thread 中的日志 EventLoop started消息 和 EventLoop stopped消息 日志文件意外分离，经过排查发现原因如下
hlog_set_file或hlog_set_xxxx各种设置后，在httpserver多线程或自己的业务线程运行时，外部执行 -s stop 或 -s restart 触发 signal_handler 或其他形式的原因只要调用 exit 就会触发 atexit 的 hv_destroy_default_logger销毁，此时其他工作线程使用的logger被重置导致开头的hlog_set_各类设置失效。
我发现其他人也遇到过类似现象 #171