misc: vmm: 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

vmm/src/api/mod.rs

@@ -36,6 +36,7 @@ pub mod http;
 use std::io;
 use std::sync::mpsc::{RecvError, SendError, Sender, channel};
 
+use log::info;
 use micro_http::Body;
 use serde::{Deserialize, Serialize};
 use thiserror::Error;