tests/gnrc_ipv6_nib_6ln: blacklist boards with insufficient memory
tests/gnrc_ipv6_nib_6ln: blacklist boards with insufficient memory

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