split cord-stack variables from cord-pod variables

Change-Id: Iba80b66ca55c84f78fd7e404845f418706d8a055
diff --git a/cord-pod-ansible/cord-pod-playbook.yaml b/cord-pod-ansible/cord-pod-playbook.yaml
index c8512c4..7b92361 100644
--- a/cord-pod-ansible/cord-pod-playbook.yaml
+++ b/cord-pod-ansible/cord-pod-playbook.yaml
@@ -4,6 +4,7 @@
   hosts: head
   tasks:
     - include_vars: vars/cord-pod_defaults.yml
+    - include_vars: vars/cord-stack_defaults.yml
 
 - name: Prerequisites
   hosts: head