gbataille - use mkdtemp to work in a temp directory

[todo]

gdal2tiles/gdal2tiles.py

Lines 2918 to 2923 in 18e7284

	# TODO: gbataille - use mkdtemp to work in a temp directory
	# TODO: gbataille - debug intermediate tiles.vrt not produced anymore?
	# TODO: gbataille - Refactor generate overview tiles to not depend on self variables
	argv = gdal.GeneralCmdLineProcessor(sys.argv)
	input_file, output_folder, options = process_args(argv[1:])
	nb_processes = options.nb_processes or 1

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This issue was generated by todo based on a TODO comment in 18e7284. It's been assigned to @kylebarron because they committed the code.