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:

geonode/geonode/br/management/commands/backup.py

Lines 106 to 107 in 3c66a54

	if options.get("setup_logger"):
	utils.setup_logger()

Such logger setup could be used in create_tile_layers as well.