Comment 6 for bug 1337349

Exposing the host UUID to guests is an intentional step whose goal is to allow OS/software inventory programs and/or license validation programs to track the deployment of instances on hosts. Replacing this will a randomly generated UUID is certainly not a viable approach. If they wish to, admins can replace the host UUID with a different static uuid by setting the 'host_uuid' parameter in /etc/libvirt/libvirtd.conf

That Dell allows you to obtain so much sensitive information from an identifier is never considered or intended to be a secret is a flaw in itself.