tests: don't ignore shutdown hangs in failure injector #5677
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Cover letter
Previously, a hang on SIGINT would be logged, but then
the test would proceed with a node in this zombie state.
Since shutdown hangs are always a bug, it is correct to fail
the test as early as we can with the right reason, so just
re-raise the exception instead of trying to proceed.
Related: #5178
UX changes
None
Release notes