Updated openstack/openstack
Project: openstack/nova  7093b847f624300dcc9452063187c1da735e0c85
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libvirt: configuration element for a random number generator device

This configuration exposes a paravirtual random number generator device,
with a default backend set to a hosts /dev/random

An optional rate element can be provided in order to limit the consumption
of host's entropy by the guest.

Partially implements blueprint libvirt-rng-device
Change-Id: Id1be32a307473aec2ff0b54b43b2ca3547d74b84