Refactor download role (#5697)

* download file

* download containers

* fix push image to nodes

* pull if none image on host

* fix

* improve docker image tag checks.
do not pull already cached images

* rebase fix merge conflict

* add support download_run_once when upgrade and scale cluster
add some test with download_run_once

* set default values to temp flag for every download cycle

* add save,load abilty for containerd and crio when download_run_once=true

* return redefine image save/load command to  set_docker_image_facts.yml

* move set command to set_container_facts

* ctr in containerd_bin_dir

* fix order of ctr image export arguments

* temporary disable download_run_once for containerd and crio
due https://github.com/containerd/containerd/issues/4075

* remove unused files

* fix strict yaml linter warning and errors

* refactor logical conditions to pull and cache container images

* remove comment due lint check

* document role

* remove image_load_on_localhost, because cached images are always loaded to docker on remote sites

* remove XXX from debug output

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

@@ -249,3 +249,21 @@
     that: kubeadm_control_plane
     msg: "kubeadm etcd mode requires experimental control plane"
   when: etcd_kubeadm_enabled
+
+- name: Stop if download_localhost is enabled but download_run_once is not
+  assert:
+    that: download_run_once
+    msg: "download_localhost requires enable download_run_once"
+  when: download_localhost
+
+- name: Stop if download_localhost is enabled when container_manager not docker
+  assert:
+    that: container_manager == 'docker'
+    msg: "download_run_once support only for docker. See https://github.com/containerd/containerd/issues/4075 for details"
+  when: download_run_once or download_force_cache
+
+- name: Stop if download_localhost is enabled for CoreOS or Flatcar
+  assert:
+    that: ansible_os_family not in ["CoreOS", "Coreos", "Container Linux by CoreOS", "Flatcar", "Flatcar Container Linux by Kinvolk"]
+    msg: "download_run_once not support for CoreOS or Flatcar"
+  when: download_run_once or download_force_cache