net/cord_ep: adapt to gcoap API changes
net/cord_ep: adapt to gcoap API changes

yogo1212/RIOT,mtausig/RIOT,josephnoir/RIOT,josephnoir/RIOT,ant9000/RIOT,kaspar030/RIOT,x3ro/RIOT,jasonatran/RIOT,kaspar030/RIOT,ant9000/RIOT,RIOT-OS/RIOT,mtausig/RIOT,jasonatran/RIOT,basilfx/RIOT,x3ro/RIOT,yogo1212/RIOT,basilfx/RIOT,kaspar030/RIOT,OTAkeys/RIOT,aeneby/RIOT,authmillenon/RIOT,smlng/RIOT,yogo1212/RIOT,basilfx/RIOT,yogo1212/RIOT,jasonatran/RIOT,x3ro/RIOT,x3ro/RIOT,josephnoir/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,kYc0o/RIOT,mtausig/RIOT,smlng/RIOT,mtausig/RIOT,kYc0o/RIOT,toonst/RIOT,josephnoir/RIOT,basilfx/RIOT,ant9000/RIOT,ant9000/RIOT,authmillenon/RIOT,basilfx/RIOT,aeneby/RIOT,OlegHahm/RIOT,smlng/RIOT,jasonatran/RIOT,OTAkeys/RIOT,aeneby/RIOT,toonst/RIOT,OlegHahm/RIOT,josephnoir/RIOT,kYc0o/RIOT,mtausig/RIOT,RIOT-OS/RIOT,miri64/RIOT,yogo1212/RIOT,kaspar030/RIOT,authmillenon/RIOT,kYc0o/RIOT,toonst/RIOT,authmillenon/RIOT,OlegHahm/RIOT,smlng/RIOT,OlegHahm/RIOT,OTAkeys/RIOT,x3ro/RIOT,miri64/RIOT,miri64/RIOT,toonst/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT,jasonatran/RIOT,kaspar030/RIOT,miri64/RIOT,yogo1212/RIOT,OlegHahm/RIOT,authmillenon/RIOT,OTAkeys/RIOT,authmillenon/RIOT,aeneby/RIOT,miri64/RIOT,ant9000/RIOT,RIOT-OS/RIOT,aeneby/RIOT,toonst/RIOT,smlng/RIOT