Add no_log entries to skopeo copy commands

Now that these work, we should disable logging because the password
appears in the command.

Change-Id: I0c5d0be9bffb48bb576f61b7ff19f4451353b7e2

roles/pull-from-intermediate-registry/tasks/main.yaml

@@ -20,4 +20,4 @@
     docker://{{ buildset_registry.host }}:{{ buildset_registry.port }}/{{ item.metadata.repository }}:{{ item.metadata.tag }}
   when: "item.metadata.type | default('') == 'container_image'"
   loop: "{{ zuul.artifacts | default([]) }}"
-  # no_log: true  TODO(corvus): replace
+  no_log: true

roles/push-to-intermediate-registry/tasks/push-image.yaml

@@ -8,7 +8,7 @@
   loop: "{{ image.tags | default(['latest']) }}"
   loop_control:
     loop_var: image_tag
-  # no_log: true  TODO(corvus) replace
+  no_log: true
 
 - name: Return artifact to Zuul
   zuul_return: