Add haveged

[ioerror]

I suggest adding the haveged package to any system where entropy collection is required.

[dolanjs]

With an external entropy device?

[ioerror]

dolanjs:

With an external entropy device?

haveged is useful regardless - I suggest adding it anyway. It will add
entropy to the kernel entropy pool even without network, a hardware rng,
and so on.