trace_id 是变动的，mysql 的 和 request_in 和 request_out 的不一样 about gin_scaffold

[e421083458]

之前代码没有传递ctx上下文，现在调整好了。

[INFO][2020-02-17T11:55:15.590][log.go:58] _com_request_in||cspanid=||method=GET||args=map[]||traceid=c0a803045e4a0ea37ee0fc98104dc7b0||spanid=9ee20da7380704bb||uri=/demo/dao?id=1||body=||from=127.0.0.1
[INFO][2020-02-17T11:55:15.590][log.go:58] _com_mysql_success||level=sql||affected_row=1||cspanid=||spanid=9ee20da7380704bb||source=/Users/niuyufu/go/src/git.xiaojukeji.com/cloud/its-service/signal-upm/dao/demo.go:25||current_time=2020-02-17 11:55:15||proc_time=0.000000000||sql=SELECT * FROM area WHERE (id = '1')||traceid=c0a803045e4a0ea37ee0fc98104dc7b0
[INFO][2020-02-17T11:55:15.590][log.go:58] _com_request_out||uri=/demo/dao?id=1||args=map[]||from=127.0.0.1||proc_time=0.001729409||traceid=c0a803045e4a0ea37ee0fc98104dc7b0||cspanid=||method=GET||response={"errno":0,"errmsg":"","data":"[{\"id\":1,\"area_name\":\"area_name\",\"city_id\":1,\"user_id\":2,\"update_at\":\"2019-06-15T00:00:00+08:00\",\"create_at\":\"2019-06-15T00:00:00+08:00\",\"delete_at\":\"2019-06-15T00:00:00+08:00\"}]","trace_id":"c0a803045e4a0ea37ee0fc98104dc7b0"}||spanid=9ee20da7380704bb