Fix node cycle on HA Validation

This commit fixes the way the test suite is cloned on each node.
With the new ansible release the old fashion is not good anymore, it
fails while substituting items.
This solution has been tested and it is working.

Change-Id: I7609945b5ef2e6b932ba23441c7e773631dc60b4

roles/validate-ha/tasks/main.yml

@@ -23,15 +23,13 @@
   when: apply_workarounds
 
 - name: Get overcloud-ha-test-suite on undercloud and controllers
-  vars:
-    nodes:
-      - "undercloud"
-      - "{{ groups['controller'] }}"
   shell: >
     rm -rf tripleo-director-ha-test-suite;
     git clone https://github.com/rscarazz/tripleo-director-ha-test-suite/ tripleo-director-ha-test-suite;
   delegate_to: "{{ item }}"
-  with_items: "{{ nodes }}"
+  with_items:
+    - "undercloud"
+    - "{{ groups['controller'] }}"
 
 - name: HA test failed actions (overcloud)
   delegate_to: overcloud-controller-0