Copy log files instead of moving them
Copy log files instead of moving them

Copying the log files leaves the most recent log files for the user
to see. This is mostly convenient after a single run (with options
-b -r 1).

Change-Id: I0a8e572bdcff208f08d9b1c021dfa06dddd732bb

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