[Tile-serving] [openstreetmap/osm2pgsql] Add an option to TRUNCATE instead of DROP CASCADE when --create option set (#758)

[Nikolai Lebedev]

Is it possible to have an option of doing a `TRUNCATE` on imported tables instead of `DROP CASCADE`? I'm loosing a lot of views this way. So I have to truncate tables manually and use an `--append` option instead of `--create`, which slows things down very much.

I have a db with a previously imported osm data, but it's easier in this case to reload all the tables instead of updating them with diffs.

What happens if I restrict `DROP` to the `osm2pgsql` user? Will the script continue to load in existing tables or throw an error? 


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