Bug#863710: journald's most recent entries

[defanor]

> There were lots of changes regarding the journal between v215 and v232
> (which is the version in the upcoming stretch release).
>
> Would be great if you can try and reproduce the problem with that
> version. If it still happens, this should be taken upstream.

I've reproduced it with a shell script on v215 now, by printing same 5
messages every 2 hours for a day or so -- so that I'd have some idea of
how to test it on v232 (otherwise it would be hard to tell if the bug is
still there).

Going to try it with v232 either on a VM or on the same machine once it
will be updated to Debian 9 (probably in a month).