[Tile-serving] [openstreetmap/osm2pgsql] Lua relation members gets post-way transform member tags (#659)

[Paul Norman]

My inclination is that this is a bug. I can probably work around it in ClearTables by encoding all the tags into one column as text, since I have a function to do that

```lua
--- Turns a lua table into a PostgreSQL hstore
-- @param table table to convert
-- @return table in hstore string format
function hstore (table)
    if table ~= nil then
        local s = ''
        for k,v in pairs(table) do
            s = s..',"'..string.gsub(string.gsub(k,'\\','\\\\'),'"', '\\"')..'"=>"'..string.gsub(string.gsub(v,'\\','\\\\'),'"', '\\"')..'"'
        end
        return string.sub(s, 2) -- clean up first ,
    end
end

function wood_ways(tags, num_keys)
    if tags["natural"] == wood then
        local cols = {}
        cols.name = tags["name"]
        cols.original_tags = hstore(tags)
        return 0, cols, 1, 0
    end
    return 1, {original_tags = hstore(tags)}, 0, 0
end
```

I'll then have the call ``wood_rel_members({type="multipolygon"}, {{original_tags='"natural"=>"wood"'}, {}}, {"",""}, 2)``, which contains the information required. But this feels like an ugly hack.

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