Fixed some issues in admin tests testing against old APIs
Fixed some issues in admin tests testing against old APIs

hds/django-hvad,andialbrecht/django-hvad,vstoykov/django-hvad,promil23/django-hvad,philippeowagner/django-hvad,piha/django-hvad,piha/django-hvad,philippeowagner/django-hvad,hds/django-hvad,andialbrecht/django-hvad,ojii/django-nani,ojii/django-nani,promil23/django-hvad,vstoykov/django-hvad