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/vars/suse.yml

@@ -0,0 +1,15 @@
+---
+docker_kernel_min_version: '0'
+
+docker_package_info:
+  pkg_mgr: zypper
+  pkgs:
+    - name: docker
+
+docker_repo_key_info:
+  pkg_key: ''
+  repo_keys: []
+
+docker_repo_info:
+  pkg_repo: ''
+  repos: []