Shutdown heartbeating last to prevent execution classified as dead wh…

…en stopping the execution is slow (since heartbeating already have stopped). (#368)

db-scheduler/src/main/java/com/github/kagkarlsson/scheduler/Scheduler.java

@@ -157,11 +157,12 @@ void stop(Duration utilExecutorsWaitBeforeInterrupt, Duration utilExecutorsWaitA
             }
         }
 
+        executor.stop(shutdownMaxWait);
+
+        // Shutdown heartbeating thread last
         if (!ExecutorUtils.shutdownAndAwaitTermination(housekeeperExecutor, utilExecutorsWaitBeforeInterrupt, utilExecutorsWaitAfterInterrupt)) {
             LOG.warn("Failed to shutdown housekeeper-executor properly.");
         }
-
-        executor.stop(shutdownMaxWait);
     }
 
     public void pause() {