[Tile-serving] [openstreetmap/osm2pgsql] Flex output: split ways at endpoints of other ways and create geometries for each part (#1459)

[routingincircles]

I'm trying to use osm2pgsql to create a network suitable for routing, like osm2pgrouting does. To that end, I first collect the end nodes of ways in stage 1. Then in stage 2 I split each way at interior nodes (i.e. non-start-or-end-nodes) that are start or end nodes of other ways. 

I observed that in the Lua callback function `osm2pgsql.process_way()` I can call add_row() more than once, and this way feed each part of the way to the database as a separate row. What I'm missing though is a possibility to create the geometry only for the respective part. Currently I can only add an attribute  `geom    = { create = 'line' }` to the row which would generate the geometry of the entire unsplitted way.

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https://github.com/openstreetmap/osm2pgsql/issues/1459
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