Merge pull request #2935 from k8s-infra-cherrypick-robot/cherry-pick-2920-to-release-1.6

[release-1.6] remove --listen-client-urls injection from ipv6 template

Author: k8s-ci-robot

templates/cluster-template-ipv6.yaml

@@ -5,7 +5,6 @@ metadata:
 spec:
   kubeadmConfigSpec:
     postKubeadmCommands:
-      - sed -i '\#--listen-client-urls#s#$#,https://127.0.0.1:2379#' /etc/kubernetes/manifests/etcd.yaml
       # This frees up :53 on the host for the coredns pods
       - echo "DNSStubListener=no" >> /etc/systemd/resolved.conf
       - mv /etc/resolv.conf /etc/resolv.conf.OLD && ln -s /run/systemd/resolve/resolv.conf /etc/resolv.conf