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

kernel/syscall/process.rs

@@ -227,7 +227,7 @@ pub fn clone(flags: usize, stack_base: usize) -> Result<usize> {
                             let scheme = schemes.get(file.scheme).ok_or(Error::new(EBADF))?;
                             scheme.clone()
                         };
-                        let result = scheme.dup(file.number);
+                        let result = scheme.dup(file.number, &[]);
                         result
                     };
                     match result {