get_original_user: override source_image_facts

See https://github.com/ansible/ansible/issues/15710#issuecomment-216645922
for the context.

So we need to override the source_image_facts in the block to make
sure we can get the image infos later.


Change-Id: Iedef1fa3791342479915cf36a30c18602a402c3f
Closes-Bug: #1836048

tasks/get_original_user.yml

@@ -17,8 +17,12 @@
             name: "{{ source_image }}"
           retries: 5
           delay: 5
-          until: source_image_facts.images is defined
-          register: source_image_facts
+          until: downloaded_image_facts.images is defined
+          register: downloaded_image_facts
+        # https://github.com/ansible/ansible/issues/15710#issuecomment-216645922
+        - name: Override source_image_facts
+          set_fact:
+            source_image_facts: "{{ downloaded_image_facts }}"
       when: source_image_facts.images | length == 0
     - name: Set original_user with Docker
       set_fact: