[Tile-serving] [openstreetmap/osm2pgsql] store all relation tags to hstore (#556)

[Paul Norman]

https://github.com/openstreetmap/osm2pgsql/blob/master/tagtransform.cpp#L132-L134

```cpp
for (const auto& rel_tag: rel_tags) {
    //copy the name tag as "route_name"
    if (is_route && (rel_tag.key == "name"))
        out_tags.push_dedupe(tag_t("route_name", rel_tag.value));
    //copy all other tags except for "type"
    if (rel_tag.key != "type")
        out_tags.push_dedupe(rel_tag);
}
```

This is intentional. If you want to have this information in your database, using your own Lua tag transform is your best bet.

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