Merge pull request #1141 from mattymo/idempotency2

roles/download/tasks/set_docker_image_facts.yml

roles/etcd/tasks/check_certs.yml

roles/etcd/tasks/gen_certs_script.yml

roles/etcd/tasks/main.yml

roles/etcd/tasks/pre_upgrade.yml

roles/kubernetes/master/tasks/main.yml

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

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

roles/kubernetes/secrets/tasks/gen_certs_script.yml

roles/kubernetes/secrets/tasks/gen_tokens.yml

roles/network_plugin/calico/tasks/main.yml

roles/network_plugin/canal/tasks/main.yml

roles/network_plugin/cloud/tasks/main.yml