Add gap for timestamp to update

Author: kthui

qa/L0_model_update/instance_update_test.py

@@ -163,6 +163,7 @@ def test_cpu_instance_update(self):
         self.__update_instance_count(0, 4)  # remove 4 instances
         self.__update_instance_count(0, 3)  # remove 3 instances
         self.__update_instance_count(0, 0)  # no change
+        time.sleep(0.1)  # larger the gap for config.pbtxt timestamp to update
         self.__update_instance_count(2, 0)  # add 2 instances
         self.__update_instance_count(5, 0)  # add 5 instances
         self.__unload_model()