simplify thread daemon usage

daemon/core/api/grpc/client.py

@@ -146,8 +146,9 @@ def start_streamer(stream: Any, handler: Callable[[core_pb2.Event], None]) -> No
     :param handler: function that handles an event
     :return: nothing
     """
-    thread = threading.Thread(target=stream_listener, args=(stream, handler))
-    thread.daemon = True
+    thread = threading.Thread(
+        target=stream_listener, args=(stream, handler), daemon=True
+    )
     thread.start()
 
 

daemon/core/api/tlv/corehandlers.py

@@ -949,8 +949,8 @@ class CoreHandler(socketserver.BaseRequestHandler):
                             file_name,
                             {"__file__": file_name, "coreemu": self.coreemu},
                         ),
+                        daemon=True,
                     )
-                    thread.daemon = True
                     thread.start()
                     # allow time for session creation
                     time.sleep(0.25)

daemon/core/emane/emanemanager.py

@@ -682,8 +682,9 @@ class EmaneManager(ModelManager):
             )
             return
         self.doeventloop = True
-        self.eventmonthread = threading.Thread(target=self.eventmonitorloop)
-        self.eventmonthread.daemon = True
+        self.eventmonthread = threading.Thread(
+            target=self.eventmonitorloop, daemon=True
+        )
         self.eventmonthread.start()
 
     def stopeventmonitor(self) -> None:

daemon/core/nodes/network.py

@@ -70,8 +70,7 @@ class EbtablesQueue:
             return
 
         self.doupdateloop = True
-        self.updatethread = threading.Thread(target=self.updateloop)
-        self.updatethread.daemon = True
+        self.updatethread = threading.Thread(target=self.updateloop, daemon=True)
         self.updatethread.start()
 
     def stopupdateloop(self, wlan: "CoreNetwork") -> None: