WIP: Run GnuTLS connection tests with TLS 1.3 disabled

Closed Michael Catanzaro requested to merge mcatanzaro/rerun-tests into master

Some tests have regressed with TLS 1.2, but I didn't notice because we are currently not testing it anywhere. Run all the tests with TLS 1.2 as well as TLS 1.3.

This is WIP because the tests are still flaky.

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