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/download/tasks/check_pull_required.yml

@@ -6,19 +6,17 @@
 # nginx:1.15,gcr.io/google-containers/kube-proxy:v1.14.1,gcr.io/google-containers/kube-proxy@sha256:44af2833c6cbd9a7fc2e9d2f5244a39dfd2e31ad91bf9d4b7d810678db738ee9,gcr.io/google-containers/kube-apiserver:v1.14.1,etc...
 - name: check_pull_required |  Generate a list of information about the images on a node
   shell: "{{ image_info_command }}"
-  delegate_to: "{{ download_delegate if download_run_once else inventory_hostname }}"
   no_log: true
   register: docker_images
   failed_when: false
   changed_when: false
   check_mode: no
-  become: "{{ not download_localhost }}"
   when: not download_always_pull
 
 - name: check_pull_required | Set pull_required if the desired image is not yet loaded
   set_fact:
     pull_required: >-
-      {%- if image_reponame in docker_images.stdout.split(',') %}false{%- else -%}true{%- endif -%}
+      {%- if image_reponame | regex_replace('^docker\.io/(library/)?','') in docker_images.stdout.split(',') %}false{%- else -%}true{%- endif -%}
   when: not download_always_pull
 
 - name: check_pull_required | Check that the local digest sha256 corresponds to the given image tag