a0ee569091
follow new naming conventions for gcr's coredns image. starting from 1.21 kubeadm assumes it to be `coredns/coredns`: this causes the kubeadm deployment being unable to pull image, beacuse `v` was also added in image tag, until the role `kubernetes-apps` ovverides it with the old name, which is only compatible with <=1.7. Backward comptability with kubeadm <=1.20 is mantained checking kubernetes version and falling back to old names (`coredns:1.xx`) when the version is less than 1.21 |
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