Simplify

Co-authored-by: Jesse Glick <[email protected]>

src/main/java/hudson/remoting/Engine.java

@@ -904,7 +904,7 @@ ExponentialRetry next(EngineListenerSplitter events) throws InterruptedException
                 return null;
             } else {
                 events.status("Waiting " + DurationFormatter.format(next.delay) + " before retry");
-                TimeUnit.SECONDS.sleep(next.delay.toSeconds());
+                Thread.sleep(next.delay.toMillis());
             }
             return next;
         }