Change the default IPv6 prefix from aaaa::/64 to fd00::/64

core/net/ipv6/sicslowpan.c

core/net/ipv6/uip-ds6.h

core/net/rpl/rpl-dag-root.c

cpu/native/net/wpcap.c

examples/cc2530dk/border-router/README.md

examples/cc2530dk/udp-ipv6/client.c

examples/cc2530dk/udp-ipv6/ping6.c

examples/cc2530dk/udp-ipv6/server.c

examples/cc2538-common/mqtt-demo/project-conf.h

examples/er-rest-example/Makefile

examples/er-rest-example/README.md

examples/hello-world/README.md

examples/ipv6/json-ws/json-ws.c

examples/ipv6/multicast/root.c

examples/ipv6/multicast/sink.c

examples/ipv6/native-border-router/Makefile

examples/ipv6/native-border-router/slip-config.c

examples/ipv6/rpl-border-router/Makefile

examples/ipv6/rpl-collect/udp-sender.c

examples/ipv6/rpl-collect/udp-sink.c