Use new user logic in oauth registrants API
Use new user logic in oauth registrants API

The CSRF checks no longer need to be disabled manually because any
oauth-authenticated request is no longer subject to CSRF checks.

ThiefMaster/indico,DirkHoffmann/indico,DirkHoffmann/indico,ThiefMaster/indico,pferreir/indico,DirkHoffmann/indico,DirkHoffmann/indico,indico/indico,pferreir/indico,indico/indico,ThiefMaster/indico,indico/indico,ThiefMaster/indico,pferreir/indico,indico/indico,pferreir/indico