[Tile-serving] [openstreetmap/osm2pgsql] Rewrite tile expiry (management of expired tiles) (#709)

[Michael Reichert]

@pnorman wrote:
if I'm reading your description right, the two methods are the same for outputting just a single zoom, right?

Yes, they are not almost the same.

![differences between different tile expiry implementations](https://cloud.githubusercontent.com/assets/3611273/23973745/d0249196-09d7-11e7-98dc-386020564a29.png)

The screen shot shows the expired tiles from the same [dataset](https://michreichert.de/share/public/osm2pgsql/expiry-example-shapes.zip) as used above on zoom level 12. Red tiles were written to the output file by both implementations. Blue tiles were only written by my implementation. Both implementations used the same code to detect which tiles should be marked. The database was set back to the state before the application of the diff, i.e. testing conditions were equal.

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