Update importuser command to also allow adding to classes.
Update importuser command to also allow adding to classes.

lyw07/kolibri,mrpau/kolibri,jonboiser/kolibri,indirectlylit/kolibri,lyw07/kolibri,DXCanas/kolibri,indirectlylit/kolibri,indirectlylit/kolibri,learningequality/kolibri,lyw07/kolibri,DXCanas/kolibri,DXCanas/kolibri,jonboiser/kolibri,learningequality/kolibri,benjaoming/kolibri,learningequality/kolibri,lyw07/kolibri,mrpau/kolibri,DXCanas/kolibri,jonboiser/kolibri,mrpau/kolibri,benjaoming/kolibri,mrpau/kolibri,benjaoming/kolibri,jonboiser/kolibri,indirectlylit/kolibri,learningequality/kolibri,benjaoming/kolibri