remove some code that is unused

src/openflow/controller.rs

 use std::{io::Write, mem::size_of, net::TcpStream};
 
 use byteorder::{BigEndian, WriteBytesExt};
-use etherparse::SlicedPacket;
 
 use super::OfpHeader;
 
@@ -29,13 +28,7 @@ impl Controller {
     }
 
     pub fn packetIn(&self, xid: u32, payload: &Vec<u8>, stream: &mut TcpStream) {
-        match SlicedPacket::from_ethernet(&payload) {
-            Ok(value) => {
-                println!("vlan {:?}", value.vlan);
-                println!("net {:?}", value.net);
-            }, 
-            Err(_) => println!("Error"),
-        }
+        // pass
     }
 
     pub fn send(&self, xid: u32, message: u8, payload: &Vec<u8>, stream: &mut TcpStream) {