Cirrus: Collect ginkgo node logs artifacts

In rare cases, it's possible for one of the ginkgo processes to "hang".
When this occurs, the main output will contain this message:

``Ginkgo timed out waiting for all parallel nodes to report``

The only way to debug this was to look through concatenated printing
of the ginkgo node logs.  This is a tedious and daunting task,
requiring special search knowledge, facing a "wall of text".

Simplify the situation by collecting the node logs separately, as
individual files in a cirrus-artifact.  In this way, it's faster to
figure out which test "hung" by examining each log individually.  The
log file which does not have a pass/fail summary at the end,
indicates the last test hung (for whatever reason), and includes it's
output (if any).

Signed-off-by: Chris Evich <cevich@redhat.com>

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