AthenaPoolExampleAlgorithms: Fix tests.

Update reference files.

Clean up test run script, to try to fix spurious test failures.
They seemed to be associated with running the long grep/sed pipeline.
So remove everything from there that is already handled in TestTools,
and collapse it to a single sed and single grep invocation.


Former-commit-id: c82200dbceaf0a776059f3c0e682bf5770240209