[Tile-serving] [openstreetmap/mod_tile] How to use protocol version 3? (#176)

[Juga Paazmaya]

Thanks for the suggestion @SomeoneElseOSM, I will try to add pieces..

This commit added a "protocol version 3", https://github.com/openstreetmap/mod_tile/commit/fdc317a8f36f001d3eb2a864eb7cff55f11fdeb7

While I have compiled the `master` of mod_file and have Mapnik v3.0.18 installed, running `sudo renderd -f` displays requests with png mimetype, such as

```
renderd[27281]: DEBUG: Got incoming request with protocol version 2
renderd[27281]: DEBUG: Got command RenderBulk fd(14) xml(default), z(13), x(4662), y(2371), mime(image/png), options()
terminate called after throwing an instance of 'mapnik::image_writer_exception'
  what():  Mapnik does not support grayscale images for png
Aborted
```

Whil the counterpart in httpd/error_log is:

```
tile_translate: testing baseuri(/osm/) name(default) extension(jpg),
```

And the Leaflef.js based map requests the tiles as jpg files.

The mapnik configuration also has the `format` property set to `jpeg`.

The cause for trying to render png images, is in my understanding due to the incoming request using the "protocol version 2".



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