Setup clouds.yaml on tempest node

Since clouds.yaml is used by os_tempest role to perform most of
the resource creation stuff, so we need to setup clouds.yaml on
the same.

Change-Id: Idd23ce08949a64831db8d777216d9aef3d0531db

test-install-tempest.yml

@@ -25,7 +25,20 @@
   become: True
   gather_facts: true
   any_errors_fatal: true
-  roles:
-    - role: "{{ tempest_rolename | default('os_tempest') }}"
   vars_files:
     - test-vars.yml
+  tasks:
+    - name: Setup clouds.yaml for the root user
+      include_role:
+        name: openstack_openrc
+        private: yes
+      vars:
+        openrc_file_dest: "/root/openrc"
+        openrc_file_owner: "root"
+        openrc_openstack_client_config_dir_dest: "/root/.config/openstack"
+        openrc_openstack_client_config_dir_owner: "root"
+        openrc_clouds_yml_file_owner: "root"
+
+    - name: Include Tempest role
+      include_role:
+        name: "{{ tempest_rolename | default('os_tempest') }}"