Import clear-nonjobs Fedora patch

Ondřej Pohořelskýrequested to merge
opohorel/at:clear_nonjobs into master

Hi, I would like to upstream some Fedora patches that we are using since long time ago. Sadly they are older and most of them lack documentation/bugs. I'll try to provide as much info as I can.

This patch originates from this commit

clear non-job files from at dir

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