make listen_io local, stop io on handshake sock err, make default error handler prompts less panic
make listen_io local, stop io on handshake sock err, make default error handler prompts less panic

OptimusLime/lua-websockets,enginix/lua-websockets,OptimusLime/lua-websockets,lipp/lua-websockets,enginix/lua-websockets,OptimusLime/lua-websockets,KSDaemon/lua-websockets,lipp/lua-websockets,KSDaemon/lua-websockets,enginix/lua-websockets,lipp/lua-websockets,KSDaemon/lua-websockets