Merge branch 'bugfix/drop-obsolete-code-and-global-variable-in-apt-cron' into 'master'

Drop apt::cron::download, and turn $apt_cron_hours into a class parameter for ap…

…t::cron::dist_upgrade.

I've introduced apt::cron::download, am not using it anymore, and have
never seen anyone else submit a bug or a merge request for it. Thus,
I feel pretty confident in dropping it.

And this allows me to trivially get rid of the $apt_cron_hours global
variable noticed by LeLutin in #13.

(I've mistakenly marked !44 as merged)

See merge request !47

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