cron: Rewrite and cleanup cron_tests.sh script

Look for results into more possible log locations, look also into
journalctl output.

This fixes systems with different cron log (Debian, Ubuntu and their
derivates, see github issue #136) and systems which log into journalctl
only (openSUSE Tumbleweed).

Signed-off-by: Petr Vorel <pvorel@suse.cz>
2 files changed