downloads: split file and containers (#13581)

Splits the definitions into two dicts, while joining then for now to
preserve the downloads dict.

Update all consumers of the variables, which are roughly:
- manual includes of the download role (which will be removed in the
  short future)
- install tasks using the resolved 'dest' to find the artefacts

This will make further division of the downloads role easier.

roles/network_plugin/calico/tasks/install.yml

@@ -11,7 +11,7 @@
 
 - name: Calico | Copy calicoctl binary from download dir
   copy:
-    src: "{{ downloads.calicoctl.dest }}"
+    src: "{{ downloads_file.calicoctl.dest }}"
     dest: "{{ bin_dir }}/calicoctl"
     mode: "0755"
     remote_src: true
@@ -128,7 +128,7 @@
   block:
     - name: Calico | Create calico manifests for kdd
       copy:
-        src: "{{ downloads.calico_crds.dest }}"
+        src: "{{ downloads_file.calico_crds.dest }}"
         dest: "{{ kube_config_dir }}/kdd-crds.yml"
         mode: "0644"
         remote_src: true

roles/network_plugin/cni/tasks/main.yml

@@ -9,7 +9,7 @@
 
 - name: CNI | Copy cni plugins
   unarchive:
-    src: "{{ downloads.cni.dest }}"
+    src: "{{ downloads_file.cni.dest }}"
     dest: "/opt/cni/bin"
     mode: "0755"
     owner: "{{ cni_bin_owner }}"