listener: support multi-accept like nginx

While accepting a single connection at-a-time is likely best for
multi-worker and/or load-balanced deployments; accepting
multiple connections at once should be less bad on overloaded
single-worker systems.

We can't automatically pick the best value here since worker
counts are dynamic via SIGTTIN/SIGTTOU.  Process managers
(e.g. systemd) can also spawn multiple instances sharing a
single listener with no knowledge sharing between listeners.

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