misc: net_util: drop extern crate, use modern rust

This commit is part of a series of similar commits.

Signed-off-by: Philipp Schuster <philipp.schuster@cyberus-technology.de>
On-behalf-of: SAP philipp.schuster@sap.com

net_util/src/queue_pair.rs

@@ -8,6 +8,7 @@ use std::os::unix::io::{AsRawFd, RawFd};
 use std::sync::Arc;
 use std::sync::atomic::{AtomicU64, Ordering};
 
+use log::{error, info};
 use rate_limiter::{RateLimiter, TokenType};
 use thiserror::Error;
 use virtio_queue::{Queue, QueueOwnedT, QueueT};