gnrc_ipv6_nib_router: add support to send RDNSSO
gnrc_ipv6_nib_router: add support to send RDNSSO

gebart/RIOT,lazytech-org/RIOT,kYc0o/RIOT,OTAkeys/RIOT,basilfx/RIOT,lazytech-org/RIOT,josephnoir/RIOT,jasonatran/RIOT,avmelnikoff/RIOT,josephnoir/RIOT,OlegHahm/RIOT,basilfx/RIOT,avmelnikoff/RIOT,cladmi/RIOT,toonst/RIOT,ant9000/RIOT,OTAkeys/RIOT,rfuentess/RIOT,lazytech-org/RIOT,aeneby/RIOT,mfrey/RIOT,RIOT-OS/RIOT,BytesGalore/RIOT,x3ro/RIOT,authmillenon/RIOT,rfuentess/RIOT,gebart/RIOT,rfuentess/RIOT,OTAkeys/RIOT,kYc0o/RIOT,A-Paul/RIOT,A-Paul/RIOT,cladmi/RIOT,josephnoir/RIOT,cladmi/RIOT,gebart/RIOT,mfrey/RIOT,basilfx/RIOT,authmillenon/RIOT,OlegHahm/RIOT,smlng/RIOT,josephnoir/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,mtausig/RIOT,OTAkeys/RIOT,smlng/RIOT,A-Paul/RIOT,yogo1212/RIOT,aeneby/RIOT,kaspar030/RIOT,jasonatran/RIOT,avmelnikoff/RIOT,RIOT-OS/RIOT,biboc/RIOT,jasonatran/RIOT,biboc/RIOT,smlng/RIOT,OlegHahm/RIOT,cladmi/RIOT,gebart/RIOT,mtausig/RIOT,ant9000/RIOT,cladmi/RIOT,mfrey/RIOT,authmillenon/RIOT,miri64/RIOT,x3ro/RIOT,jasonatran/RIOT,BytesGalore/RIOT,jasonatran/RIOT,kaspar030/RIOT,x3ro/RIOT,kaspar030/RIOT,miri64/RIOT,authmillenon/RIOT,mtausig/RIOT,A-Paul/RIOT,rfuentess/RIOT,ant9000/RIOT,BytesGalore/RIOT,biboc/RIOT,biboc/RIOT,A-Paul/RIOT,smlng/RIOT,basilfx/RIOT,RIOT-OS/RIOT,toonst/RIOT,aeneby/RIOT,josephnoir/RIOT,miri64/RIOT,miri64/RIOT,aeneby/RIOT,kaspar030/RIOT,OTAkeys/RIOT,aeneby/RIOT,toonst/RIOT,kYc0o/RIOT,yogo1212/RIOT,avmelnikoff/RIOT,ant9000/RIOT,kYc0o/RIOT,miri64/RIOT,toonst/RIOT,authmillenon/RIOT,OlegHahm/RIOT,lazytech-org/RIOT,yogo1212/RIOT,yogo1212/RIOT,rfuentess/RIOT,mtausig/RIOT,gebart/RIOT,kbumsik/RIOT,kbumsik/RIOT,ant9000/RIOT,basilfx/RIOT,toonst/RIOT,yogo1212/RIOT,x3ro/RIOT,mfrey/RIOT,yogo1212/RIOT,lazytech-org/RIOT,kbumsik/RIOT,kYc0o/RIOT,avmelnikoff/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,mtausig/RIOT,OlegHahm/RIOT,biboc/RIOT,mfrey/RIOT,kbumsik/RIOT,BytesGalore/RIOT,x3ro/RIOT,smlng/RIOT,kbumsik/RIOT,BytesGalore/RIOT