Allow to specify database user and password in tests configuration.
Allow to specify database user and password in tests configuration.

sasha0/django-oscar,django-oscar/django-oscar,solarissmoke/django-oscar,sasha0/django-oscar,solarissmoke/django-oscar,solarissmoke/django-oscar,django-oscar/django-oscar,solarissmoke/django-oscar,sasha0/django-oscar,sasha0/django-oscar,django-oscar/django-oscar,django-oscar/django-oscar