[CORD-2874]
Fix deprecation warnings raised by Ansible 2.5

Change-Id: Icb607d267af2771b046b46399ce5f0d182f629ab
diff --git a/roles/juju-compute-setup/tasks/main.yml b/roles/juju-compute-setup/tasks/main.yml
index dff82cd..d24fe0e 100644
--- a/roles/juju-compute-setup/tasks/main.yml
+++ b/roles/juju-compute-setup/tasks/main.yml
@@ -1,4 +1,4 @@
-
+---
 # Copyright 2017-present Open Networking Foundation
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -13,8 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-
----
 # roles/juju-compute-setup/main/tasks.yml
 
 # Code for this is in library/juju_facts.py
@@ -77,7 +75,7 @@
 - name: Verify that the nodes appear in nova
   action: shell bash -c "source /opt/cord_profile/admin-openrc.sh; nova hypervisor-list | grep '{{ item }}'"
   register: result
-  until: result | success
+  until: result is success
   retries: 20
   delay: 15
   with_items: "{{ groups['compute'] }}"