[1.2.X] Fixed regression in running the GeoDjango test suite after r13670 with...

[1.2.X] Fixed regression in running the GeoDjango test suite after r13670 with addition of `GeoDjangoTestSuiteRunner` (replaces `run_gis_tests`, which is now a stub).

Backport of r13755 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@13756 bcc190cf-cafb-0310-a4f2-bffc1f526a37