Debugging the CSI driver tests depends a lot on the output of the CSI
sidecar containers and the CSI driver, but that information was not
captured automatically and thus unavailable after a test run. This is
particularly bad when running in a remote CI system, but also manually
watching the cluster during a test was cumbersome.

Now pod events and log messages get copied to the test's output at the
time that they happen (when running without report directory) or get
written to individual log files (when running with report directory in
the CI).