Package Socket:

- fix tcp,udp,unix socket
- add socket unixgram for session less unix socket
- optmize process & code
- add some standalone test for server / client (add example server config for
  rsyslog)

Package Network/Protocol:
- add unixgram protocol

Package Errors:
- fix bug in loop to prevent circular include

socket/server/udp/inerface.go

@@ -59,8 +59,6 @@ func New(h libsck.Handler, sizeBuffRead libsiz.Size) ServerTcp {
 		fe: new(atomic.Value),
 		fi: new(atomic.Value),
 		fs: new(atomic.Value),
-		tr: new(atomic.Value),
-		tw: new(atomic.Value),
 		sr: sr,
 		ad: new(atomic.Value),
 	}