refactor shibboleth get_display_name
refactor shibboleth get_display_name

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