purchase_delivery_address

This module adds a delivery address to the purchase order, which is
automatically propagated to the generated picking.

Moreover, when a sale order generates a purchase in drop shipping mode, the
generated purchase has the delivery address set.

The idea is that this way dropshipping pickings have a trace of the desired
delivery address. The partner_id field of the picking is already used for the
supplier.
I wonder if for this one we shouldn't have stock_dropshipping in dependancies and search it by xml id as I did here:

https://github.com/OCA/purchase-workflow/pull/47/files#r19790441

In anyway we must be consistent between both modules.