generate secrets on first master

roles/coreos-bootstrap/tasks/main.yml

roles/kubernetes/secrets/files/kube-gen-token.sh

roles/kubernetes/secrets/files/make-ssl.sh

roles/kubernetes/secrets/files/tokens/.gitkeep

roles/kubernetes/secrets/tasks/check-tokens.yml

roles/kubernetes/secrets/tasks/gen_certs.yml

roles/kubernetes/secrets/tasks/gen_tokens.yml

roles/kubernetes/secrets/tasks/main.yml