Add comment to explain why we sleep a little after spawning the thread.

src/rest_api_test.rs

@@ -24,7 +24,7 @@ lazy_static! {
         let hdl = Arc::new(Mutex::new(Some(thread::spawn(move || {
             task::block_on(start(&config.clone())).unwrap();
         }))));
-        println!("Server thread spawned");
+        // Have a nap to let the scheduler start the new thread
         thread::sleep(std::time::Duration::from_millis(5));
         hdl
     };