[Tile-serving] [openstreetmap/osm2pgsql] Tile Expiry Performance (#946)

[Michael Reichert]

@pnorman 

Single day diff, deduplicated with Osmium, no expiry:

```
node cache: stored: 2640740(100.00%), storage efficiency: 78.01% (dense blocks: 271, sparse nodes: 582526), hit rate: 2.97%
        Command being timed: "/home/michael/osm2pgsql/build/osm2pgsql --append -s -d expirytest --cache 3000 --hstore single-day-diff/463-deduplicated.osc.gz --flat-nodes /nvme/michael/osm2pgsqltest/flatnodes-import.flat --slim --number-processes 4 --style /home/michael/git/openstreetmap-carto/openstreetmap-carto.style --tag-transform-script /home/michael/git/openstreetmap-carto/openstreetmap-carto.lua"
        Elapsed (wall clock) time (h:mm:ss or m:ss): 15:55.81
        Maximum resident set size (kbytes): 48364060
```

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