check_file_age: add option to provide perf data (#1292)

[Holger Weiß]

While at it: Multiple values should be separated by a space character, not
by a semicolon.   Apart from that, it would be nice if it would also print
the `warn` and/or `crit` fields (when the user specified thresholds on the
command line).	Maybe also `min=0`, at least for the file size (I guess the
age might be negative if the file's `mtime` is in the future?).  See the
[Development Guidelines][1] for the expected format.

Thanks a lot!

[1]: https://www.monitoring-plugins.org/doc/guidelines.html#AEN200

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