[Piuparts-reports] archive_old_logs

[piuparts master]

experimental
`pass/libvips-doc_7.42.1-2.log' -> `archive/pass/libvips-doc_7.42.1-2.log'


sid2experimental
`pass/libvips-doc_7.42.1-2.log' -> `archive/pass/libvips-doc_7.42.1-2.log'


Archived 2 old logfiles.