brpc框架默认将日志输出到屏幕，读官方文档说需要使用logging::SetLogSink指定日志刷入目标，这里没有十分理解。
建议看这片文章：https://blog.csdn.net/Boring_Wednesday/article/details/107408544?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522163574287216780255247602%2522%252C%2522scm%2522%253A%252220140713.130102334..%2522%257D&request_id=163574287216780255247602&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~all~sobaiduend~default-1-107408544.first_rank_v2_pc_rank_v29&utm_term=brpc%E6%97%A5%E5%BF%97&spm=1018.2226.3001.4187