[Tile-serving] [openstreetmap/osm2pgsql] Drop slim mode tables just after finishing processing pending ways an… (#612)

[Marcos Dione]

I found how to. I tested locally with this command:

`osm2pgsql --username mdione --database gis --cache 1024 --number-processes 4 --verbose \
    --slim --flat-nodes /home/mdione/src/projects/osm/nodes.cache --hstore \
    --multi-geometry --style /home/mdione/src/projects/osm/openstreetmap-carto.style --tag-transform-script /home/mdione/src/projects/osm/openstreetmap-carto.lua \
    --drop`

And it works, the file `nodes.cache` is deleted after `Going over pending relations...`, which frees a lot of space for indexing.

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