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

[Anne Blankert]

I did some testing with a smaller osm.pbf and the PostGres default max_connections of 100 on a many cores processor.
osm2pgsql always fails if option --number-processes is greater than 12.

`Osm2pgsql failed due to ERROR: Connection to database failed: FATAL:  remaining connection slots are reserved for non-replication superuser connections`

osm2pgsql version 0.94.0 (64 bit id space)

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