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

tests/files/packet_centos7-calico-ha-once-localhost.yml

@@ -0,0 +1,14 @@
+---
+# Instance settings
+cloud_image: centos-7
+mode: ha
+
+# Kubespray settings
+kube_network_plugin: calico
+download_localhost: true
+download_run_once: true
+deploy_netchecker: true
+dns_min_replicas: 1
+typha_enabled: true
+calico_backend: kdd
+typha_secure: true

tests/files/packet_centos7-calico-ha.yml

@@ -5,7 +5,7 @@ mode: ha
 
 # Kubespray settings
 kube_network_plugin: calico
-download_localhost: true
+download_localhost: false
 download_run_once: true
 deploy_netchecker: true
 dns_min_replicas: 1

tests/files/packet_debian9-calico-upgrade-once.yml

@@ -0,0 +1,10 @@
+---
+# Instance settings
+cloud_image: debian-9
+mode: default
+
+# Kubespray settings
+kube_network_plugin: calico
+deploy_netchecker: true
+dns_min_replicas: 1
+download_run_once: true

tests/files/packet_ubuntu18-flannel-containerd-once.yml

@@ -0,0 +1,29 @@
+---
+# Instance settings
+cloud_image: ubuntu-1804
+mode: ha
+vm_memory: 1600Mi
+
+# Kubespray settings
+kubeadm_control_plane: true
+kubeadm_certificate_key: 3998c58db6497dd17d909394e62d515368c06ec617710d02edea31c06d741085
+kube_proxy_mode: iptables
+kube_network_plugin: flannel
+helm_enabled: true
+kubernetes_audit: true
+container_manager: containerd
+etcd_events_cluster_enabled: true
+local_volume_provisioner_enabled: true
+etcd_deployment_type: host
+deploy_netchecker: true
+dns_min_replicas: 1
+kube_encrypt_secret_data: true
+ingress_nginx_enabled: true
+cert_manager_enabled: true
+# Disable as health checks are still unstable and slow to respond.
+metrics_server_enabled: false
+metrics_server_kubelet_insecure_tls: true
+kube_token_auth: true
+kube_basic_auth: true
+enable_nodelocaldns: false
+download_run_once: true