Fixed #7531 -- Modified the sites test so that user-provided initial data...

Fixed #7531 -- Modified the sites test so that user-provided initial data doesn't cause breakage when executed from within user applications. Thanks for the report, madkinder@gmail.com.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@7738 bcc190cf-cafb-0310-a4f2-bffc1f526a37