chroot-unittest: cleanup the logs for each new unit test
chroot-unittest: cleanup the logs for each new unit test

SUSE-Cloud/automation,SUSE-Cloud/automation,aspiers/automation,aspiers/automation,vmoravec/automation,aspiers/automation,vmoravec/automation,aspiers/automation,gosipyan/automation,SUSE-Cloud/automation,SUSE-Cloud/automation,gosipyan/automation,vmoravec/automation,gosipyan/automation,vmoravec/automation,gosipyan/automation