shrink-osd: don't run ceph-facts entirely

We need to call ceph-facts only for setting `container_binary`.
Since this task has been isolated we can use `tasks_from` to only execute the
needed task.

Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>

infrastructure-playbooks/shrink-osd.yml

@@ -60,6 +60,7 @@
 
     - import_role:
         name: ceph-facts
+        tasks_from: container_binary.yml
 
   post_tasks:
     - name: set_fact container_exec_cmd build docker exec command (containerized)