[1.2.X] Add `setUp` and `tearDown` methods to the geographic feed and sitemap...

[1.2.X] Add `setUp` and `tearDown` methods to the geographic feed and sitemap tests to ensure `Site` exists for tests.

Backport of r15856 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@15857 bcc190cf-cafb-0310-a4f2-bffc1f526a37