Make test_suites.sh run multiple iterations of the tests. #7433
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The default is to run 20 times (which takes ~3 seconds on a Mac
laptop), but it's configurable via the first command-line arg.
The changes to the actual loop body over test_array are:
killing $background_pid and then exiting with an error from the kill
command and trying to kill it again).
Problem
Intermittent failures are only caught by some test runs.
Change overview
Have each test run run the tests 20 of times, making it more likely to catch intermittent problems.
Testing
Ran the script locally to make sure that the new setup does not fail. Verified via the log that the tests did indeed get run 20 times.