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

[Paul Norman]

![image](https://cloud.githubusercontent.com/assets/1190866/21508400/e8029e8c-cc35-11e6-9f81-60442896be70.png)
PR to the left in this one.

I see no particularly significant differences between the two runs. So I'm fine merging or not, but see no real differences in a full planet import.

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