Add rng pci-e device to vms
A customer requested, because our vm-s start slow because of entropy starvation.
A fix is to add the pcie device, however easily we can only fix this for new vms:
because we are using the qemu backend we could somehow add it live to existing vm-s but it would require more effort:
we could recommend our users to install haveged but:
"The quality of the generated entropy is not guaranteed and sometimes contested"¹