Adds test to see that the autosample time is updated 

* Adds test to see that the autosample time is updated and shows something beyond default if the instrument runs for more than a minute.
* To ensure that the instrument runs more than a minute in this test, a gevent.sleep(90) was added.
* This satisfies CIDEVSA-463, which required an int test to check that the autosample duration attribute works.