collect more http trace info like remote IP which is a import message

[zhong-wx]

to do that, we just add more field in TraceInfo struct
and remote IP can get from Request.clientTrace.ci.gotConnInfo.Conn.RemoteAddr()

[jeevatkm]

@zhong-wx Are you interested in sending in PR?

[zhong-wx]

I will send it :)

[jeevatkm]

@zhong-wx I have added the remote address info, you can leave it.