[1.6.x] Fixed #22613 -- Added formfield_for_choice_field() to the list of methods that InlineModelAdmin supports.
[1.6.x] Fixed #22613 -- Added formfield_for_choice_field() to the list of methods that InlineModelAdmin supports.

Backport of 986bd41f8a from master

django-nonrel/django,django-nonrel/django,felixjimenez/django,felixjimenez/django,redhat-openstack/django,felixjimenez/django,redhat-openstack/django,felixjimenez/django,django-nonrel/django,redhat-openstack/django,redhat-openstack/django,django-nonrel/django