Add images downloader to download roles (#3914)

* Add images downloader to download roles

* Use single jinja2 templates

* add kube_version to templates

roles/download/tasks/kubeadm_images.yml

+- name: kubeadm | Create kubeadm config
+  template:
+    src: "kubeadm-images.yaml.j2"
+    dest: "{{ kube_config_dir }}/kubeadm-images.yaml"
+
+- name: container_download | download images for kubeadm config images
+  command: "{{ local_release_dir }}/kubeadm config images pull --config={{ kube_config_dir }}/kubeadm-images.yaml"

roles/download/tasks/main.yml

@@ -24,3 +24,8 @@
     - item.value.container | default(false)
     - download_run_once
     - group_names | intersect(download.groups) | length
+
+- include_tasks: kubeadm_images.yml
+  when:
+    - not skip_downloads|default(false)
+    - inventory_hostname in groups['kube-master']

roles/download/templates/kubeadm-images.yaml.j2

+{% if kube_version is version('v1.11.0', '<') %}
+apiVersion: kubeadm.k8s.io/v1alpha1
+{% elif kube_version is version('v1.11.0', '>=') and kube_version is version('v1.12.0', '<') %}
+apiVersion: kubeadm.k8s.io/v1alpha2
+{% elif kube_version is version('v1.12.0', '>=') and kube_version is version('v1.13.0', '<') %}
+apiVersion: kubeadm.k8s.io/v1alpha3
+{% else %}
+apiVersion: kubeadm.k8s.io/v1beta1
+{% endif %}
+{% if kube_version is version('v1.12.0', '<') %}
+kind: MasterConfiguration
+{% else %}
+kind: ClusterConfiguration
+{% endif %}
+imageRepository: {{ kube_image_repo }}
+kubernetesVersion: {{ kube_version }}