use proxmox-sys 0.2.1 and proxmox-io 1.0.1

And remove unused code from pbs-tools.

Signed-off-by: Dietmar Maurer <dietmar@proxmox.com>

proxmox-backup-client/src/mount.rs

@@ -140,7 +140,7 @@ fn mount(
 
     // Process should be daemonized.
     // Make sure to fork before the async runtime is instantiated to avoid troubles.
-    let (pr, pw) = pbs_tools::io::pipe()?;
+    let (pr, pw) = proxmox_sys::pipe()?;
     match unsafe { fork() } {
         Ok(ForkResult::Parent { .. }) => {
             drop(pw);