Cherry-pick #10789 to 6.7: [Heartbeat] Fix flaky SSL test with retries. #10999
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Cherry-pick of PR #10789 to 6.7 branch. Original message:
Sometimes the httptest package when using fancy TLS options doesn't put the server up as fast as it should (at least that's the theory), and we hit before it's ready, causing a false test failure. This patch makes those tests more resilient.
It's possible there's something else at work here, but this bug is only seen on CI, and impossible to repro on my laptop.
Fixes #10722