Converted or_lookups tests from doctests to unittests. We have always been at...

Converted or_lookups tests from doctests to unittests.  We have always been at war with doctests.  Thanks to Paul Tax for the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@14236 bcc190cf-cafb-0310-a4f2-bffc1f526a37