Unpurchased items in the shoppingcart should be removed if the enrollment period has closed

@afzaledx 
@chrisndodge Kindly review the changes for WL-164.

Thanks
this is a little unclear. I think you can take a line and do something like:

`is_any_course_expired, __, __, __ = verify_for_closed_enrollment(request.user)`

Same for L596