Add support to Ansible 2.9 (#5361)

README.md

contrib/vault/roles/vault/tasks/bootstrap/ca_trust.yml

roles/container-engine/docker/tasks/main.yml

roles/container-engine/docker/tasks/systemd.yml

roles/download/tasks/download_container.yml

roles/download/tasks/download_file.yml

roles/download/tasks/prep_download.yml

roles/download/tasks/sync_container.yml

roles/download/tasks/sync_file.yml

roles/etcd/meta/main.yml

roles/etcd/tasks/upd_ca_trust.yml

...tes-apps/cloud_controller/oci/tasks/credentials-check.yml

roles/kubernetes-apps/helm/tasks/main.yml

roles/kubernetes/master/tasks/kubeadm-setup.yml

roles/kubernetes/preinstall/handlers/main.yml

roles/kubernetes/preinstall/tasks/0020-verify-settings.yml

roles/kubernetes/preinstall/tasks/0040-set_facts.yml

roles/kubernetes/preinstall/tasks/0060-resolvconf.yml

roles/kubernetes/preinstall/tasks/0070-system-packages.yml

...ubernetes/preinstall/tasks/0080-system-configurations.yml