[1.0.X] Fixed #10432 -- Handle all kinds of iterators in queryset filters.

Only consumes the iterators once and works with Python 2.3.

Backport of r9986 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@9987 bcc190cf-cafb-0310-a4f2-bffc1f526a37