[Tile-serving] [openstreetmap/mod_tile] Tiles cache does not work for low zoom (#260)

[Stephan]

your tile is 267,021 seconds old.

default configuration:
```
	scfg->cache_duration_dirty = 15 * 60;
	scfg->cache_duration_last_modified_factor = 0.0;
	scfg->cache_duration_max = 7 * 24 * 60 * 60;
	scfg->cache_duration_minimum = 3 * 60 * 60;
	scfg->cache_duration_low_zoom = 6 * 24 * 60 * 60;
	scfg->cache_duration_medium_zoom = 1 * 24 * 60 * 60;
```

you are overwriting the settings for LowZoom. So for zoom levels 0-9, your minimum cache duration should be quite large.

Can you also share how you handle `planet-import-complete` and what timestamp this file has? mtime older than this one would also expire tiles.




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