tests: Do not wipe out testing directory on error.
tests: Do not wipe out testing directory on error.

Addressing testers wondering like:
Only in /tmp/tmp.QMXpY8mvdu: (null)
Only in ./rds_split_simple: report-request.xml
Only in ./rds_split_simple: report.xml
The files are different after going through result data stream!
$ ls /tmp/tmp.QMXpY8mvdu/
ls: cannot access /tmp/tmp.QMXpY8mvdu/: No such file or directory

postfix/openscap,redhatrises/openscap,jan-cerny/openscap,openprivacy/openscap,postfix/openscap,Hexadorsimal/openscap,mpreisler/openscap,jan-cerny/openscap,redhatrises/openscap,redhatrises/openscap,Hexadorsimal/openscap,ybznek/openscap,ybznek/openscap,mpreisler/openscap,openprivacy/openscap,OpenSCAP/openscap,mpreisler/openscap,redhatrises/openscap,postfix/openscap,ybznek/openscap,jan-cerny/openscap,postfix/openscap,postfix/openscap,openprivacy/openscap,postfix/openscap,redhatrises/openscap,jan-cerny/openscap,jan-cerny/openscap,OpenSCAP/openscap,mpreisler/openscap,Hexadorsimal/openscap,OpenSCAP/openscap,mpreisler/openscap,ybznek/openscap,Hexadorsimal/openscap,Hexadorsimal/openscap,ybznek/openscap,jan-cerny/openscap,OpenSCAP/openscap,openprivacy/openscap,openprivacy/openscap,ybznek/openscap,redhatrises/openscap,Hexadorsimal/openscap,mpreisler/openscap,openprivacy/openscap,OpenSCAP/openscap,OpenSCAP/openscap