[Tile-serving] [openstreetmap/osm2pgsql] Should we issue DROP TABLE ... CASCADE (#687)

[Paul Norman]

I have a setup where I have a view on a rendering table, and `osm2pgsql --create` fails when dropping tables with

```
Setting up table: pier_line_raw
Osm2pgsql failed due to ERROR: DROP TABLE IF EXISTS pier_line_raw failed: ERROR:  cannot drop table pier_line_raw because other objects depend on it
DETAIL:  view pier_line depends on table pier_line_raw
HINT:  Use DROP ... CASCADE to drop the dependent objects too.
```

Given that `--create` is a destructive operation to previous data in the DB, I think we should `DROP TABLE ... CASCADE`

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