How to enable virtio random number generator (RNG) in Red Hat OpenStack

Solution In Progress - Updated -

Issue

How to enable virtio random number generator (RNG) in Red Hat OpenStack? The RHEL 6 Virtualization Administration Guide describes the configuration of Random Number Generator (RNG) Device in chapter 9.6. How can one enable this feature in OpenStack?

Environment

Red Hat Enterprise Linux OpenStack Platform 5.0
Red Hat Enterprise Linux OpenStack Platform 6.0
Red Hat Enterprise Linux OpenStack Platform 7.0
Red Hat OpenStack Platform 8.0

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