Cloning Host: Device Identifier has already been taken
When cloning a host with a nic with a interface identifier set, the interface identifier is correctly copied from the original host. Even if the original and cloned hosts just have a single interface each, the cloned host's device identifier field is marked as invalid because the value "has already been taken".
When the interface is cloned, the host_id is copied from the original host. The uniqueness validation is scoped to host_id.