Fixed #7715 -- Modified the admin_scripts tests to do an app level import,...

Fixed #7715 -- Modified the admin_scripts tests to do an app level import, rather than a project level import. This removes the potential for conflict between the admin script tests and the settings for the test suite itself. Thanks to Malcolm Tredinnick for his help hunting this one down.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@7887 bcc190cf-cafb-0310-a4f2-bffc1f526a37