Fix user import doctest
Fix user import doctest

This was broken as Adhocracy doesn't return a 401 unauthorized response,
but is automatically redirected to the login page. The test now checks
for the latter.

DanielNeugebauer/adhocracy,alkadis/vcv,DanielNeugebauer/adhocracy,phihag/adhocracy,SysTheron/adhocracy,SysTheron/adhocracy,liqd/adhocracy,phihag/adhocracy,phihag/adhocracy,phihag/adhocracy,alkadis/vcv,DanielNeugebauer/adhocracy,alkadis/vcv,alkadis/vcv,alkadis/vcv,phihag/adhocracy,DanielNeugebauer/adhocracy,liqd/adhocracy,DanielNeugebauer/adhocracy,liqd/adhocracy,liqd/adhocracy,SysTheron/adhocracy