Improve logging for create_tile_layers command

[etj]

create_tile_layers does not log anything.

In command backup a little utility method was added in order to make sure something is logged on console: https://github.com/GeoNode/geonode/blob/3c66a54cb8d8b617fb046345767f09bb57bde5de/geonode/br/management/commands/backup.py#L106-L107

Such logger setup could be used in create_tile_layers as well.