Kill running acceptance test nodes on error, and show their output #1770
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Motivation
When our CI fails some acceptance tests, we don't get enough output to diagnose the error.
Solution
These changes help us diagnose errors that happen while one or more acceptance test nodes are running.
The code in this pull request has:
Review
This is pretty important, because it helps diagnose bugs like #1765 and #1769.
Related Issues
Diagnostics for #1765
Diagnostics for #1769
#1766 provides diagnostics in
zebrad
code, this PR prints them when the test errors.Follow Up Work
Actually fix the bugs causing the CI failures.