suit: Remove non-standard hello handler
suit: Remove non-standard hello handler

ant9000/RIOT,jasonatran/RIOT,miri64/RIOT,OTAkeys/RIOT,kYc0o/RIOT,ant9000/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,kaspar030/RIOT,authmillenon/RIOT,OlegHahm/RIOT,OTAkeys/RIOT,miri64/RIOT,OTAkeys/RIOT,RIOT-OS/RIOT,smlng/RIOT,authmillenon/RIOT,yogo1212/RIOT,miri64/RIOT,OTAkeys/RIOT,kYc0o/RIOT,OlegHahm/RIOT,OTAkeys/RIOT,basilfx/RIOT,basilfx/RIOT,smlng/RIOT,yogo1212/RIOT,authmillenon/RIOT,ant9000/RIOT,jasonatran/RIOT,OlegHahm/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,RIOT-OS/RIOT,kaspar030/RIOT,OlegHahm/RIOT,OlegHahm/RIOT,kaspar030/RIOT,ant9000/RIOT,basilfx/RIOT,basilfx/RIOT,basilfx/RIOT,yogo1212/RIOT,smlng/RIOT,miri64/RIOT,kYc0o/RIOT,smlng/RIOT,kYc0o/RIOT,miri64/RIOT,kaspar030/RIOT,authmillenon/RIOT,ant9000/RIOT,yogo1212/RIOT,jasonatran/RIOT,yogo1212/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,jasonatran/RIOT,authmillenon/RIOT,kaspar030/RIOT,yogo1212/RIOT,smlng/RIOT