Install rngd packages in the minimal images

With newer kernels it takes far longer in early boot to get random numbers (as >= 4.18 kernels ensure good quality entropy is availble before starting providing randomness).

Install rng-tools to integrate with hardware random number generators while jitterentropy-rngd can provide randomness without.

Signed-off-by: Sjoerd Simons sjoerd.simons@collabora.co.uk