This stops using the wsgi module indirection. Which caused unneeded
I think those modules were to match what we do for deposit and swh-web (django apps).
Because django's doc mentions wsgi modules  
So, in the end, it's not necessary to follow that convention here. That
introduces indirection and unneeded state (which can cause problem).
This will allow for the respective python3 packages to drop that unnecessary module (which is wip on my machine right now).
 Related D2101#48716