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

[Paul Norman]

The OSMF servers don't use osm2pgsql expiry, but instead have [expire.rb](https://github.com/openstreetmap/chef/blob/743225d946/cookbooks/tile/files/default/ruby/expire.rb). I'm not sure which method it is closer to.

[render_expired](https://github.com/openstreetmap/mod_tile/blob/master/src/render_expired.c) is another way, written by @woodpeck which consumes a tile list. I'm not sure if it recurses up/down or not.

WMF uses [tilerator](https://github.com/kartotherian/tilerator#parsing-updates-file) in [pyramid mode](https://github.com/kartotherian/tilerator#pyramid-mode) which parses the osm2pgsql output but requires just a single zoom level (i.e. osm2pgsql is run with `--expire-tiles 15`)

@zerebubuth, can you add some comment on how mapzen is using the osm2pgsql tile expiry? tilezen/vector-datasource#118 points at https://github.com/mapzen/vagrant-tiles but it's deprecated, so I'm not sure what is currently being done.


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