Fix publications/collection DDP update routing to select the correct collection for change updates.
Fix publications/collection DDP update routing to select the correct collection for change updates.

commoncode/django-ddp,commoncode/django-ddp,django-ddp/django-ddp,commoncode/django-ddp,commoncode/django-ddp,django-ddp/django-ddp,django-ddp/django-ddp,django-ddp/django-ddp