Fix net.Conn interface.
Fix net.Conn interface.

lixin9311/shadowsocks-go,cnlangzi/shadowsocks-go,chenzhenjia/shadowsocks-go,blacktear23/shadowsocks,blacktear23/shadowsocks,arthurkiller/shadowsocks-go,menghan/shadowsocks-go,126ium/shadowsocks-go,laplaceliu/shadowsocks-go,lijinpei/shadowsocks-go,arthurkiller/shadowsocks-go,shadowsocks/shadowsocks-go,126ium/shadowsocks-go,lijinpei/shadowsocks-go,chenzhenjia/shadowsocks-go,menghan/shadowsocks-go,cnlangzi/shadowsocks-go,shadowsocks/shadowsocks-go,lixin9311/shadowsocks-go,laplaceliu/shadowsocks-go