Fix kubeadm images templates (#3936)
Fix kubeadm images templates (#3936)

download v1.12.3 kubernetes images failed
kubernetes-incubator/kubespray,Atoms/kubespray,kubernetes-sigs/kubespray,Atoms/kubespray,kubespray/kargo,kubernetes-incubator/kargo,kubespray/kargo,kubernetes-sigs/kubespray,Atoms/kubespray,kubernetes-sigs/kubespray,kubernetes-sigs/kubespray,kubernetes-incubator/kubespray,Atoms/kubespray,kubernetes-incubator/kargo