Order of the machine-id files

[Fridrich Strba]

Hello, good people,

I had a number of bug reports with some software not working really
well when the DBUS_MACHINE_UUID_FILE and the /etc/machine-id files
differ in their content. I don't know how it comes to be, since I
cannot reproduce on any of my machines of virtual machines, but real
users have the two files diverging. I would like to propose an
attached patch that might actually solve that issue, since the
/etc/machine-id would be looked for first and only if it does not
exist, the /var/lib/dbus/machine-id would be considered.

I am just not sure whether I did not oversee any problematic
side-effect that this change would have.

Please, advise

Fridrich
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