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

[Paul Norman]

> always expire only the perimeter of boundary relations or don't expire them at all

The perimeter is generally safe. Not doing them at all might be a problem.

> don't expire route relations – the changed members are important and they get expired, too

This would be a problem in many cases. For example, if the ref, network, or other properties used for rendering change, then the tiles containing the linestring of the relation would need to be dirtied.

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