* Use find to delete files recursively
Instead of using rm -rf use find to delete files recursively. This
has the added benefit that we do not need to rely on shell expansion.
In particular, shell expansion caused the --one-file-system flag to
not work as intended: The idea was that the content of a (left-over)
bind mounted directory would not get deleted. However, since shell
expansion passed the directory to rm, rm happily deleted also files in
that bind mounted directory.
* Pass arguments correctly
* Fix argument order and stderr output
* Improve error handling
Log with exception level if there is an OS level error. Decode the
stderr output correctly.
* Remove unnecessary newline
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