Define setting to use many domains in tilejson tile url

[submarcos]

Actually tilejson generate a single relative url in list.

To work wirh mapbox, we need to define possible values to generate absolute urls.

Ex :

From

tiles : ["/features/tile/{z}/{x}/{y}"]

To

tiles: [
  "https://a.mydomain.com/features/tile/{z}/{x}/{y}",
  "https://b.mydomain.com/features/tile/{z}/{x}/{y}"
]

• By discovering ALLOWED_HOSTS and SSL settings or just with VECTORTILES_BASEURLS ?