Download containers and save all

Move version/repo vars to download role.
Add container to download params, which overrides url/source_url,
if enabled.
Fix networking plugins download depending on kube_network_plugin.

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

roles/etcd/meta/main.yml

@@ -3,8 +3,7 @@ dependencies:
   - role: adduser
     user: "{{ addusers.etcd }}"
     when: ansible_os_family != 'CoreOS'
-  - role: download
-    file: "{{ downloads.etcd }}"
-    when: etcd_deployment_type == "host"
   - role: docker
     when: (ansible_os_family != "CoreOS" and etcd_deployment_type == "docker" or inventory_hostname in groups['k8s-cluster'])
+  - role: download
+    file: "{{ downloads.etcd }}"