make image downloading modular
diff --git a/roles/xos-vm-install/templates/xos-setup-vars.yml.j2 b/roles/xos-vm-install/templates/xos-setup-vars.yml.j2
index 415a079..2d5ab15 100644
--- a/roles/xos-vm-install/templates/xos-setup-vars.yml.j2
+++ b/roles/xos-vm-install/templates/xos-setup-vars.yml.j2
@@ -6,3 +6,5 @@
 
 xos_configuration: "{{ xos_configuration }}"
 
+xos_images:
+{{ xos_images | to_nice_yaml }}