Bug#914511: Please enable the "virtio-rng" driver in "cloud" kernels

[Cédric Dufour <cedric.dufour@exoscale.ch>]

Now that *u*random is blocking until considered properly initialized, 
the entropy starvation [1] issue becomes a real problem during the boot 
process; e.g. it takes several minutes until one gets SSH access to the box.

[1] 
https://www.debian.org/releases/buster/amd64/release-notes/ch-information.en.html#entropy-starvation

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Cédric Dufour - Exoscale (Lausanne, Switzerland)