replace `reusePort` by `failOnExistingPort`, simpler state (single bool), no TOCTOU for numThreads=1#53

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dom96:masterfrom

timotheecour:pr_httpbeast_reusePort_multithread_v3

Commits on Jul 4, 2021

reusePort = false now default; honored regarless of numThreads
timotheecour
committed

Commits on Jul 15, 2021