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

schemes/example/src/main.rs

@@ -15,7 +15,7 @@ impl Scheme for ExampleScheme {
         Ok(0)
     }
 
-    fn dup(&self, file: usize) -> Result<usize> {
+    fn dup(&self, file: usize, _buf: &[u8]) -> Result<usize> {
         Ok(file)
     }