0895e87348
Since 8b8024f1c2 and the follow-up commits, the
main config file may be located in /usr or in other paths. But the code in
analyze.c was still assuming that it must be in /etc. Things mostly worked for
our own config files because we usually install a comments-only file in /etc,
but was not correct in the general case.
This fixes in particular 'systemd-analyze cat-config systemd/zram-generator.conf'.
In Fedora we distribute a config file in zram-generator-defaults.rpm that is in
/usr/lib, and 'cat-config' would refuse to show it because
/etc/systemd/zram-generator.conf does not exist.
The main config file is optional, but let's print an informative message
because this is a slightly unusual case.
The file paths that we printed were missing the root prefix.
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