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

[Paul Norman]

> @pnorman: for me the big difference is disk space

I don't see a disk space difference

![image](https://cloud.githubusercontent.com/assets/1190866/21739261/81b60d30-d44b-11e6-84bc-2f20b5c8b017.png)

The big DB size spike is at the end of processing, right before the slim tables are dropped.

Left is **current master**, right is this PR.

Testing this PR vs HEAD~ for memory

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