Log file handling in repeat-test.sh
Log file handling in repeat-test.sh

Write the test log into LOG_DIR during execution and move it to the
archive only after the test has run its course.

After the test, don't abort if not all log files exist.

Change-Id: I31ffce757e53e0e1b288a71bc06ff191760775cd

openstack/training-labs,openstack/training-labs,openstack/training-labs