Wrong SOAP headers
Here is the failure: https://drone.tryton.org/trypod.tryton.org/tryton/modules.stock_package_shipping_dpd/default/271eabca9d879bc946e110d64c6ac31438b0bc17
For what I understand the SOAP headers is wrongly set [1]. I do not understand how it could have worked before (except if zeep became more strict and the test server of DPD does not check token).
[1] http://docs.python-zeep.org/en/master/in-depth.html#using-soap-headers