Redo networking (#22)

* Rewriting network functions

* Add buffer to dup
Fix non-blocking handling by triggering once on enabling events to read to EOF

* Modifications for UDP API

* Implement TCP client side

* Add active close

* Add DMAR parser

* Implement basic TCP listening. Need to improve the state machine

* Reduce debugging

* Fixes for close procedure

* Updates to fix path processing in libstd

scheme/sys/mod.rs

@@ -92,7 +92,7 @@ impl Scheme for SysScheme {
         Err(Error::new(ENOENT))
     }
 
-    fn dup(&self, id: usize) -> Result<usize> {
+    fn dup(&self, id: usize, _buf: &[u8]) -> Result<usize> {
         let (path, data, mode, seek) = {
             let handles = self.handles.read();
             let handle = handles.get(&id).ok_or(Error::new(EBADF))?;