fix #751

add config ListenTCP4

when user want to listen on the TCP4, because now almost use the ipv4.
but default lister on the ipv6
add some tips for the admin server start
file the static filter
remove the deep Caller
update the log call deep
if read the log.go then calldepth add 1
fix the variable
split the file for logs
compatibility for warn & info function add one more depth
fix #770