[Tile-serving] [openstreetmap/osm2pgsql] Non moving node updates should not update related way/relation geometries (#1046)

[Christian Quest]

I've implemented the test for location change, and it shows a 10x speedup in the node parsing step for nodes that did not move.

In the diffs I've used for my tests, a large portion of nodes had new coordinates, so the speedup is reduced but still there for the others (from 10 to 50% in my tests).

The benefit is not limited to the node parsing... but cascades to ways and relations as fewer pending ones need to be checked and updated.

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