Use is instead of ambiguous pipe

The pipe | can be interpreted as a filter and cause errors.
The correct way to define when a 'succeeded' condition is met
should be by using the word 'is'.

Change-Id: Ica8091d96a8a5f1ec93ec4f6bfb7e3f24672f29a

playbooks/integration/centos-image.yaml

@@ -26,7 +26,7 @@
         url: "{{ centos_image_url }}"
         dest: "{{ centos_image_file }}.xz"
       register: centos_image_result
-      until: centos_image_result | succeeded
+      until: centos_image_result is succeeded
       retries: 3
       delay: 10