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0f83ab407etest: display abrupt shutdown errors in console output (furszy) Pull request description: Making it easier to debug errors in the CI environment, particularly in scenarios where it's not immediately clear what happened nor which node crashed (or shutdown abruptly). A bit of context: Currently, the test framework redirects each node's stderr output stream to a different temporary file inside each node's data directory. While this is sufficient for storing the error, it isn't very helpful for understanding what happened just by reading the CI console output. Most of the time, reading the stderr file in the CI environment is not possible, because people don't have access to it. Testing Note: The displayed error difference can be observed by cherry-picking this commit9cc5393c0fon top of this branch and running any functional test. ACKs for top commit: maflcko: lgtm ACK0f83ab407etheStack: ACK0f83ab407eTree-SHA512: 83ce4d21d5316e8cb16a17d3fbe77b8649fced9e09410861d9674c233f6e9c34bcf573504e387e4f439c2841b2ee9855d0d35607fa13aa89eafe0080c45ee82d