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On clusters configured with dual-stack network the IPv4 and IPv6 addresses can be added to the main interface at different time, which results in the openshift node addresses not containing the IPv6 address. This commit fixes the issue by including `ip=dhcp,dhcp6` to the kernel args of masters and works, which sets `required-timeout` to an value that the IP configuration will be tried before succeeds. This configuration is valid for day1 dual-stack clusters only.