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

[Fabrício Zimmerer Murta]

In my case the machine has 40 threads (2x 10-core w/ HT xeon). So, how many tables is that? 3? (nodes, ways, relations?). It easily broke beyond psql connection limit. I think I limited it to about 8 processes with great results. I didn't run exhaustive tests with more and less processes though.

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