Delete …/data/tmp/* after successful upgrade. #5216
Description
The upgrade process unzips all the new files into …/data/tmp/ and then moves them to their working locations, leaving the downloaded zip-file and all the empty directories.
If the upgrade completes without error, I would like …/data/tmp/* to be automatically removed.
Just in case some aren't empty for some reason,
find …/data/tmp/* -type d -exec rmdir "{}" \;
would produce error messages for the ones that aren't empty.