[1.2.X] Converted Swiss localflavor doctests to unittests. Thanks to Idan...

[1.2.X] Converted Swiss localflavor doctests to unittests.  Thanks to Idan Gazit for the patch.  Backport of [14935].

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@14960 bcc190cf-cafb-0310-a4f2-bffc1f526a37