This will allow to purge a lot of X and GTK dependencies we don't need.

Otherwise, gnupg-agent pulls pinentry-gtk2 and a whole lot of X dependencies.

Our automated test suite *needs* parted, so currently we're
uninstalling parted just to reinstall it later every 30 minutes or so.

This partially reverts 54d9d6ae,
which I initially committed mainly to get smartd out of the way on VMs.
It's no big deal to have memlockd, memtest86+ and parted on VMs.

It's supposed to deal with multiple declarations of the same package.

... and always query hostname: SSH sessions are not always properly detected by
molly-guard, e.g. from within GNU screen.