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

[Nathaniel V. KELSO]

Nathaniel here from Mapzen. It's always nice to see old code given some love, thanks for your proposal and PR :)

Mapzen currently use a pegged version of slightly older **osm2pgsql** for Tilezen in our production vector tile service. We don't have issues with the expiry file getting larger (it is just on one machine as a previous commenter pointed out so no network issues) – but I'm curious about the resulting list of changed files.

1. Can you please add more detail on _how_ the lists are different, please?
2. Can you confirm we could still get a list of _just_ the changed tiles at a set zoom (say 15 or 16)?
3. Reading the comments it's not clear to me why this image is so different between the blue and red tiles, can you please elaborate?
  ![blue-red expired tiles](https://cloud.githubusercontent.com/assets/3611273/23973745/d0249196-09d7-11e7-98dc-386020564a29.png)

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