Comment 3 for bug 1537793

There is a regression here and we currently only randomize by 2h: https://github.com/snapcore/snapd/blob/master/debian/snapd.refresh.timer

We could change to what apt is doing: https://github.com/Debian/apt/blob/master/debian/apt-daily.timer or we could use the previous commit from John: https://github.com/ubuntu-core/snappy/commit/7669466838dd1227068abc1a8bb363cd86333c50