runtests: display the test status if tests appear hung #11980
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It sometimes happens that a test hangs during a test run and never returns.
The test harness will wait indefinitely for the results and on CI servers
the CI job will eventually be killed after an hour or two. At the end of a
test run, if results haven't come in within a couple of minutes, display
the status of all test runners and what tests they're running to help in
debugging the problem.