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/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: