etcd: deploy container engine if needed (#7532)

If the etcd cluster is separate and the etcd_deployment_type is "host",
there is no need for a container engine on the etcd nodes

Do not rely on a 'default(true)' filter, but define a proper default in
kubespray-defaults depending on etcd deployment method and if internal
or external etcd is used

roles/kubespray-defaults/defaults/main.yaml

@@ -244,6 +244,9 @@ kubelet_shutdown_grace_period: 60s
 # to give normal pods time to be gracefully evacuated
 kubelet_shutdown_grace_period_critical_pods: 20s
 
+# Whether to deploy the container engine
+deploy_container_engine: inventory_hostname in groups['k8s_cluster'] or etcd_deployment_type != 'host'
+
 # Container for runtime
 container_manager: docker
 

roles/reset/tasks/main.yml

@@ -100,7 +100,7 @@
   when:
     - crictl.stat.exists
     - container_manager in ["crio", "containerd"]
-    - deploy_container_engine|default(true)
+    - deploy_container_engine
 
 - name: reset | stop and disable crio service
   service: