[1.2.X] Fixed #15424 -- Corrected lookup of callables listed in admin inlines'...

[1.2.X] Fixed #15424 -- Corrected lookup of callables listed in admin inlines' `readonly_fields` by passing the right ModelAdmin (sub)class instance when instantiating inline forms admin wrappers. Also, added early validation of its elements. Thanks kmike for the report and Karen for the patch fixing the issue.

Backport of [15650] from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@15651 bcc190cf-cafb-0310-a4f2-bffc1f526a37