If Managed Address Congfiguration flag in the Router Advertisement
Messsage is set, we would obtain the IPv6 address though the stateful
DHCPv6 procedure.
Signed-off-by: liqinhui <liqinhui@xiaomi.com>
Support Stateless and Stateful. The renew6 is used as follows:
- Stateless: renew6 eth0
- Stateful: renew6 eth0 1
Signed-off-by: liqinhui <liqinhui@xiaomi.com>