Ipv6 addrconf(netdev_change) link becomes ready

- Ipv6 addrconf netdev_change link becomes ready
- Ipv6 addrconf netdev_change ) wlan0 link becomes ready
- Ipv6 addrconf netdev_change ) can0 link becomes ready
- Ipv6 addrconf netdev_change ) eth1 link becomes ready
- Ipv6 addrconf netdev_change ) br lan link becomes ready
- Kernel ipv6 addrconf netdev_change ) eth0 link becomes ready
- Openwrt ipv6 addrconf netdev_change br lan link becomes ready
- Ipv6 config