Switch tests to use mysqlclient connector, and enable MySQL testing on Python 3.
Switch tests to use mysqlclient connector, and enable MySQL testing on Python 3.

piha/django-hvad,hds/django-hvad,philippeowagner/django-hvad,promil23/django-hvad,promil23/django-hvad,vstoykov/django-hvad,hds/django-hvad,philippeowagner/django-hvad,vstoykov/django-hvad,piha/django-hvad