Addrconf netdev_change link becomes ready

- Addrconf(netdev_change) eth0 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
- Addrconf(netdev_up) link is not ready