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Automatic merge from submit-queue (batch tested with PRs 54437, 54714, 54720). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. Adds support for v4/v6 loopback dns bind address. **What this PR does / why we need it**: Previously, IPv4 Loopback addresses (127.0.0.1) were hard coded into the kubeadm dns deployment manifest. This PR adds support for using an IPv6 Loopback (::1) when the kube-dns Service IP is an IPv6 address. **Special notes for your reviewer**: Required for IPv6-only deployments. **Release note**: ```NONE ``` /area ipv6 /sig network