add log for debug
add log for debug

u20024804/tcpcopy,daodaoliang/tcpcopy,daodaoliang/tcpcopy,eliteYang/tcpcopy,caosiyang/tcpcopy,left2right/tcpcopy,eliteYang/tcpcopy,left2right/tcpcopy,wfxiang08/tcpcopy,caosiyang/tcpcopy,ycaihua/tcpcopy,horryq/tcpcopy,liviusATnetskope/second,horryq/tcpcopy,wfxiang08/tcpcopy,sshling/tcpcopy,liviusATnetskope/second,u20024804/tcpcopy,ycaihua/tcpcopy,sshling/tcpcopy