Get rid of deprication warnings

roles/nova-compute/tasks/main.yml

@@ -75,7 +75,7 @@
   shell: "sleep 10 && docker exec -i nova-controller.service nova-manage cell_v2 discover_hosts"
   delegate_to: "{{ hostvars[groups['nova-controller'][0]]['ansible_hostname'] }}"
   register: result
-  until: result|succeeded
+  until: result is succeeded
   retries: 7
   delay: 3
   ignore_errors: yes