Tools: autotest: fix process kill in sim_vehicle.py

Tools/autotest/sim_vehicle.py

@@ -196,9 +196,10 @@ def kill_tasks_psutil(victims):
     use this routine"""
     import psutil
     for proc in psutil.process_iter():
-        if proc.status == psutil.STATUS_ZOMBIE:
+        pdict = proc.as_dict(attrs=['name', 'status'])
+        if pdict['status'] == psutil.STATUS_ZOMBIE:
             continue
-        if proc.name in victims:
+        if pdict['name'] in victims:
             proc.kill()