[Tile-serving] [openstreetmap/osm2pgsql] Enable Postgres connection polling or query connection limit (#885)

[Sarah Hoffmann]

The default number of processes is normally set to the number of processes available in the system. If you got a number that is larger than 20, it makes me wonder if you have an unusually large system or if something is going wrong with the detection.

Independently of that your suggestion to cap the number of processes in the default is still good one. If concurrency gets too high, postgres does not fare too well in my experience. I'd probably go for 15. @pnorman, any opinions?

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