Enable delegating all downloads (binaries, images, kubeadm images) (#4420)

* Download to delegate and sync files when download_run_once

* Fail on error after saving container image

* Do not set changed status when downloaded container was up to date

* Only sync containers when they are actually required

Previously, non-required images (pull_required=false as
image existed on target host) were synced to the target
hosts. This failed as the image was not downloaded to
the download_delegate and hence was not available for
syncing.

* Sync containers when only missing on some hosts

* Consider images with multiple repo tags

* Enable kubeadm images pull/syncing with download_delegate

* Use kubeadm images list to pull/sync

'kubeadm config images pull' is replaced by collecting the images
list with 'kubeadm config images list' and using the commonly
used method of pull/syncing the images.

* Ensure containers are downloaded and synced for all hosts

* Fix download/syncing when download_delegate is a kubernetes host

roles/download/defaults/main.yml

@@ -321,7 +321,7 @@ downloads:
     enabled: true
     file: true
     version: "{{ kubeadm_version }}"
-    dest: "{{local_release_dir}}/kubeadm"
+    dest: "{{ local_release_dir }}/kubeadm-{{ kubeadm_version }}-{{ image_arch }}"
     sha256: "{{ kubeadm_binary_checksum }}"
     url: "{{ kubeadm_download_url }}"
     unarchive: false
@@ -334,7 +334,7 @@ downloads:
     enabled: true
     file: true
     version: "{{ kube_version }}"
-    dest: "{{ local_release_dir }}/hyperkube"
+    dest: "{{ local_release_dir }}/hyperkube-{{ kube_version }}-{{ image_arch }}"
     sha256: "{{ hyperkube_binary_checksum }}"
     url: "{{ hyperkube_download_url }}"
     unarchive: false