[1.0.X] The second part of fixing "related inherited models" display. Handle...

[1.0.X] 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.

Backport of r9602 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@9604 bcc190cf-cafb-0310-a4f2-bffc1f526a37