rest-server: use hypers AddrIncoming for proxmox-backup-api

this has a 'from_listener' (tokio::net::TcpListener) since hyper 0.14.5 in
the 'tcp' feature (we use 'full', which includes that; since 0.14.13
it is not behind a feature flag anymore).

this makes it possible to create a hyper server without our
'StaticIncoming' wrapper and thus makes it unnecessary.

The only other thing we have to do is to change the Service impl from
tokio::net::TcpStream to hyper::server::conn::AddStream to fulfill the trait
requirements.

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

src/bin/proxmox-backup-api.rs

@@ -108,7 +108,8 @@ async fn run() -> Result<(), Error> {
     let server = daemon::create_daemon(
         ([127,0,0,1], 82).into(),
         move |listener, ready| {
-            let incoming = proxmox_backup::tools::async_io::StaticIncoming::from(listener);
+            let incoming = hyper::server::conn::AddrIncoming::from_listener(listener)?;
+
             Ok(ready
                 .and_then(|_| hyper::Server::builder(incoming)
                     .serve(rest_server)