test.py: Added own check_valid function that checks all possible reasons for marking a test invalid
test.py: Added own check_valid function that checks all possible reasons for marking a test invalid

hioa-cs/IncludeOS,AndreasAakesson/IncludeOS,AndreasAakesson/IncludeOS,ingve/IncludeOS,alfred-bratterud/IncludeOS,AnnikaH/IncludeOS,AndreasAakesson/IncludeOS,AnnikaH/IncludeOS,mnordsletten/IncludeOS,hioa-cs/IncludeOS,AnnikaH/IncludeOS,alfred-bratterud/IncludeOS,mnordsletten/IncludeOS,ingve/IncludeOS,mnordsletten/IncludeOS,alfred-bratterud/IncludeOS,hioa-cs/IncludeOS,mnordsletten/IncludeOS,AnnikaH/IncludeOS,hioa-cs/IncludeOS,AndreasAakesson/IncludeOS,mnordsletten/IncludeOS,ingve/IncludeOS,AndreasAakesson/IncludeOS,AnnikaH/IncludeOS,AndreasAakesson/IncludeOS,alfred-bratterud/IncludeOS,ingve/IncludeOS,mnordsletten/IncludeOS,ingve/IncludeOS,hioa-cs/IncludeOS,alfred-bratterud/IncludeOS