fix passing function to thread

ubuntu_base/opportunistic_utils.py

@@ -230,7 +230,7 @@ class IdsOpportunistic:
 
             IdsOpportunistic.is_stop = False
             IdsOpportunistic.process_opportunistic_ids()
-            ids_thread = threading.Thread(target=IdsOpportunistic.start_ids())
+            ids_thread = threading.Thread(target=IdsOpportunistic.start_ids)
             ids_thread.start()
         elif not is_ids_deployed:
             # set a return condition to kill IDS process and restore iptables rules

ubuntu_base/vc_node.py

@@ -419,10 +419,10 @@ def proceed_self_stabilizing_VC():
     enable_br_netfilter()
     create_bridge(BR_CENTER_NAME)
     process_opportunistic_node(node.myid)
-    threading.Thread(target=start_process_from_queue()).start()
+    threading.Thread(target=start_process_from_queue).start()
 
     # Start process requests of unikernel update
-    threading.Thread(target=update_unikernel()).start()
+    threading.Thread(target=update_unikernel).start()
 
     # Checking the state change to deploy or remove the IDS unikernel
     # If I stay at VC set more than 5s -> I deploy IDS unikernel, otherwise, IDS unikernel must be destroyed