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

[Sarah Hoffmann]

On further thought, 15 is still far too much. Parallel execution is used in two places now:

* parallel sorting and indexing of tables on import
* processing of pending ways and relations on updates

In both cases the number of parallel threads should not be too high. Indexing requires a lot of memory and having too many in parallel running actually slows down the process. Updates are generally run in parallel with other load (like rendering) and should therefore also not take up to many CPUs.

I'd rather go for max 4 as the default.

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