ParallelHandler: avoid re-export (cleanup)

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

src/tools/mod.rs

@@ -22,7 +22,6 @@ pub mod systemd;
 pub mod ticket;
 
 pub mod parallel_handler;
-pub use parallel_handler::ParallelHandler;
 
 /// Shortcut for md5 sums.
 pub fn md5sum(data: &[u8]) -> Result<DigestBytes, Error> {

src/tools/parallel_handler.rs

@@ -1,3 +1,5 @@
+//! A thread pool which run a closure in parallel.
+
 use std::sync::{Arc, Mutex};
 use std::thread::JoinHandle;