The second part of fixing "related inherited models" display. Handle raw_id...

The second part of fixing "related inherited models" display. Handle raw_id values for child models in the admin. Fixed #9461.

I couldn't think of a way to test this automatically and robustly, however,
manual testing with the ticket example shows failure before and success
afterwards and the fix make sense logically.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@9602 bcc190cf-cafb-0310-a4f2-bffc1f526a37