Removed module-level imports from `django.test` -- this prevented running the...

Removed module-level imports from `django.test` -- this prevented running the GEOS, GDAL tests from outside a Django environment (e.g., when there's no `settings.py`).


git-svn-id: http://code.djangoproject.com/svn/django/trunk@10665 bcc190cf-cafb-0310-a4f2-bffc1f526a37