Revert "gen_certs_script: refactor using stdin (Ansible 2.4+)"
Revert "gen_certs_script: refactor using stdin (Ansible 2.4+)"

kubernetes-incubator/kubespray,kubernetes-incubator/kargo,kubespray/kargo,kubernetes-incubator/kubespray,kubespray/kargo,Atoms/kubespray,insequent/kargo,kubernetes-sigs/kubespray,Atoms/kubespray,kubernetes-incubator/kargo,Atoms/kubespray,Atoms/kubespray,insequent/kargo,kubernetes-sigs/kubespray,kubernetes-sigs/kubespray,kubernetes-sigs/kubespray