[Tile-serving] [openstreetmap/mod_tile] `render_list` not using all cores (Issue #378)

[Hummeltech]

> Oh and (sorry) one last question and then I think I'm really done... is the `num_threads` option in `renderd.conf` required, or if it's omitted will it "do the right thing" and use all available cores? The build process for the tiles machine is in ansible/packer, etc. and isn't ever serving tiles live -- so it'd be nice if I could just omit that configuration value and it'll figure out how to set itself up properly if I change instance types to something with less/more vCPUs

No, it defaults to `NUM_THREADS` (see [here](https://github.com/openstreetmap/mod_tile/blob/4143ab23bd7d26028e3f3101e25fc00233f4a967/includes/render_config.h#L103)), although that might be a good idea for a pull request.

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