Fixed #14456 -- converted inline_formsets tests from doctests to unittests. ...

Fixed #14456 -- converted inline_formsets tests from doctests to unittests.  We have always been at war with doctests.  Thanks to prestontimmons for the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@14212 bcc190cf-cafb-0310-a4f2-bffc1f526a37