Island: Refactor logic to start threads in AWSService

monkey/monkey_island/cc/services/aws/aws_service.py

@@ -84,15 +84,13 @@ class AWSService:
         results_queue = Queue()
         command_threads = []
         for i in instances:
-            command_threads.append(
-                Thread(
+            t = Thread(
                 target=self._run_agent_on_managed_instance,
                 args=(results_queue, i["instance_id"], i["os"], island_ip),
                 daemon=True,
             )
-            )
-
-        [thread.start() for thread in command_threads]
+            t.start()
+            command_threads.append(t)
 
         for thread in command_threads:
             thread.join()