Split deploy steps in separate playbooks: part1 (#3451)

* Fix bootstrap_os/ubuntu idempotency

* Update bastion role

* move container_engine in sub-roles

* requires ansible 2.5

* ubuntu18 as first CI job

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

@@ -0,0 +1,46 @@
+---
+docker_version: '18.06'
+docker_selinux_version: '17.03'
+
+docker_package_info:
+  pkgs:
+
+docker_repo_key_info:
+  repo_keys:
+
+docker_repo_info:
+  repos:
+
+dockerproject_repo_key_info:
+  repo_keys:
+
+dockerproject_repo_info:
+  repos:
+
+docker_dns_servers_strict: true
+
+docker_container_storage_setup: false
+
+# Used to override obsoletes=0
+yum_conf: /etc/yum.conf
+yum_repo_dir: /etc/yum.repos.d
+docker_yum_conf: /etc/yum_docker.conf
+
+# Fedora docker-ce repo
+docker_fedora_repo_base_url: 'https://download.docker.com/linux/fedora/$releasever/$basearch/stable'
+docker_fedora_repo_gpgkey: 'https://download.docker.com/linux/fedora/gpg'
+# CentOS/RedHat docker-ce repo
+docker_rh_repo_base_url: 'https://download.docker.com/linux/centos/7/$basearch/stable'
+docker_rh_repo_gpgkey: 'https://download.docker.com/linux/centos/gpg'
+# Ubuntu docker-ce repo
+docker_ubuntu_repo_base_url: "https://download.docker.com/linux/ubuntu"
+docker_ubuntu_repo_gpgkey: 'https://download.docker.com/linux/ubuntu/gpg'
+# Debian docker-ce repo
+docker_debian_repo_base_url: "https://download.docker.com/linux/debian"
+docker_debian_repo_gpgkey: 'https://download.docker.com/linux/debian/gpg'
+# dockerproject repo
+dockerproject_rh_repo_base_url: 'https://yum.dockerproject.org/repo/main/centos/7'
+dockerproject_rh_repo_gpgkey: 'https://yum.dockerproject.org/gpg'
+dockerproject_apt_repo_base_url: 'https://apt.dockerproject.org/repo'
+dockerproject_apt_repo_gpgkey: 'https://apt.dockerproject.org/gpg'
+docker_bin_dir: "/usr/bin"