Feature resulting image format

Closes #61 (closed)

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

openstack-ood/nodeimage.pkr.hcl

@@ -13,6 +13,7 @@ source "openstack" "image" {
   flavor            = var.flavor
   instance_name     = var.build_instance_name
 
+  use_blockstorage_volume = true
   floating_ip_network = var.floating_ip_network
   networks = var.networks
   security_groups = var.security_groups