Fix cert distribution at scale
Fix cert distribution at scale

Use stdin instead of bash args to pass node filenames and base64 data.
Use tempfile for master cert data

kubernetes-incubator/kargo,ayaz/kubespray,Atoms/kubespray,VincentS/kargo,Abdelsalam-Abbas/kubespray_fork,kubernetes-incubator/kubespray,Lendico/kargo,Atoms/kubespray,rogerwelin/kargo,insequent/kargo,kubernetes-incubator/kargo,kubernetes-sigs/kubespray,hatch-k8s/kargo,kubespray/kargo,VincentS/kargo,kubernetes-sigs/kubespray,sgm-media/kargo,Lendico/kargo,kubernetes-sigs/kubespray,galthaus/setup-kubernetes,kubernetes-sigs/kubespray,sgm-media/kargo,hatch-k8s/kargo,kubernetes-incubator/kubespray,rogerwelin/kargo,Atoms/kubespray,kubespray/kargo,Abdelsalam-Abbas/kubespray_fork,ayaz/kubespray,insequent/kargo,Atoms/kubespray,galthaus/setup-kubernetes