posix_sockets: use sin6_scope_id field to specify netif
posix_sockets: use sin6_scope_id field to specify netif

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