Enable os_tempest in baremetal-full-overcloud-validate playbook

In order to run os_tempest on FS039, os_tempest playbook i.e.
tempest.yaml needs to be called during baremetal full
overcloud validate step. This patch enables the same.

https://tree.taiga.io/project/tripleo-ci-board/task/795

Change-Id: I287e7eb8c94c6af3d243235e25fd8aa060214b13
Signed-off-by: Chandan Kumar <chkumar@redhat.com>

playbooks/baremetal-full-overcloud-validate.yml

@@ -27,7 +27,7 @@
   roles:
     - {role: validate-simple, when: test_ping|bool}
 
-# Execute tempest against the overcloud deployment
+# Execute tempest using validate-tempest against the overcloud deployment
 - name: Execute tempest against the overcloud
   hosts: undercloud
   tags:
@@ -36,6 +36,21 @@
   roles:
     - {role: validate-tempest, when: run_tempest|bool}
 
+# Execute tempest using os_tempest against the overcloud deployment
+- name: Validate the deployment
+  hosts: undercloud
+  tasks:
+    - include_tasks: tempest.yml
+      vars:
+        tempest_install_method: distro
+        tempest_cloud_name: 'overcloud'
+      when:
+        - not run_tempest|bool
+        - use_os_tempest is defined
+        - use_os_tempest|bool
+  tags:
+    - overcloud-validate
+
 - name: Delete the overcloud
   hosts: undercloud
   tags: