test/py: log when tests send CTRL-C
Write a note to the log file when a test sends CTRL-C to U-Boot. This makes it easier to follow what's happening in the logs, especially since U-Boot doesn't echo the character back to its output, so there's no other signal of what's going on. Signed-off-by: NStephen Warren <swarren@nvidia.com> Acked-by: NSimon Glass <sjg@chromium.org>
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