test: fix flaky test-http-pipeline-flood
This fixes one of the issues with this test (the repeated timeout, for which there's no real reason to validate that it only occurs exactly once). Haven't been able to reproduce the other one so perhaps there was a bug that was fixed in the meantime or something. Not sure.
Refs: https://github.com/nodejs/node/issues/16317
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines
Affected core subsystem(s)
test