Force a regeneration of /etc/machine-id in prepare for systemd-based OSes.
(Also link the dbus machine-id file to the one systemd will generate on the next boot. This seems safe and correct.) Certain things (like systemd's dhcp client) use the machine-id as a seed for derived values. For instance, systemd's dhcp client offers a ClientIdentifier in the new client style, and some servers will return the same address to *all* requesting clients, instead of returning only based on source MAC. Can't have any of that confusion.
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