playbook to refresh the VTN config in ONOS

Change-Id: I9988f4764b524478892f72b92a2de83f45a63cc9
diff --git a/roles/vtn-refresh/defaults/main.yml b/roles/vtn-refresh/defaults/main.yml
new file mode 100644
index 0000000..9243db9
--- /dev/null
+++ b/roles/vtn-refresh/defaults/main.yml
@@ -0,0 +1,8 @@
+---
+# vtn-refresh/defaults/main.yml
+
+xos_admin_user: xosadmin@opencord.org
+xos_admin_pass: "{{ lookup('password', 'credentials/xosadmin@opencord.org chars=ascii_letters,digits') }}"
+
+keystone_admin_password: "{{ lookup('password', 'credentials/cord_keystone_admin chars=ascii_letters,digits') }}"
+