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run-tests: wait for test threads after first error

The test runner has the ability to stop on first error.

Tests are executed in new Python threads. The test runner starts new
threads when it has capacity to do so. Before this patch, the "stop on
first error" logic would return immediately from the "run tests"
function, without waiting on test threads to complete. There was thus
a race between the test runner thread doing cleanup work and the test
thread performing activity. For example, the test thread could be in
the middle of executing a test shell script and the test runner
could remove the test's temporary directory. Depending on timing, this
could result in any number of output from the test runner.

This patch eliminates the race condition by having the test runner
explicitly wait for test threads to complete before continuing.

I discovered this issue as I modified the test harness in a subsequent
patch and was reliably able to tickle the race condition.

copyright (c) 2006-2010 David JEAN LOUIS

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