tests: Update to Django new 'duplicate file' mechanism.
tests: Update to Django new 'duplicate file' mechanism.

mapleoin/factory_boy,fizista/factory_boy,QuantumGhost/factory_boy,kamotos/factory_boy,adamchainz/factory_boy,muhammad-ammar/factory_boy,yograterol/factory_boy,rrauenza/factory_boy,rbarrois/factory_boy,FactoryBoy/factory_boy,dpausp/factory_boy