test: fix tmq_sim ctrl-c exit error

tests/system-test/7-tmq/tmqCommon.py

@@ -129,9 +129,12 @@ class TMQCom:
     def stopTmqSimProcess(self, processorName):
         psCmd = "ps -ef|grep -w %s|grep -v grep | awk '{print $2}'"%(processorName)
         processID = subprocess.check_output(psCmd, shell=True).decode("utf-8")
+        onlyKillOnceWindows = 0
         while(processID):
-            killCmd = "kill -INT %s > /dev/null 2>&1" % processID
-            os.system(killCmd)
+            if not platform.system().lower() == 'windows' or (onlyKillOnceWindows == 0 and platform.system().lower() == 'windows'):
+                killCmd = "kill -INT %s > /dev/null 2>&1" % processID
+                os.system(killCmd)
+                onlyKillOnceWindows = 1
             time.sleep(0.2)
             processID = subprocess.check_output(psCmd, shell=True).decode("utf-8")
         tdLog.debug("%s is stopped by kill -INT" % (processorName))