net/gcoap: remove test migrated to nanocoap
net/gcoap: remove test migrated to nanocoap

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