Feature resulting image format

Closes #61 (closed)

See if qcow2 format reduces the size of the resulting image.

openstack-ood/nodeimage.pkr.hcl

@@ -9,6 +9,7 @@ source "openstack" "image" {
   image_members     = var.image_membership
   image_auto_accept_members = var.auto_accept_members
   image_tags        = var.image_tags
+  image_disk_format = var.image_format
   flavor            = var.flavor
   instance_name     = var.build_instance_name