chg: dev: modernize test settings settings
chg: dev: modernize test settings settings

TEMPLATES is becoming mandatory.

Thanks to @claudep for the patch

Closes #1332

sgaist/django-haystack,elishowk/django-haystack,antonyr/django-haystack,sgaist/django-haystack,antonyr/django-haystack,barseghyanartur/django-haystack,elishowk/django-haystack,celerityweb/django-haystack,sgaist/django-haystack,elishowk/django-haystack,antonyr/django-haystack,barseghyanartur/django-haystack,celerityweb/django-haystack,celerityweb/django-haystack,barseghyanartur/django-haystack