Bug#711388: ITP: scandir -- Better directory iterator that returns all file info the OS provides

[Julien Puydt <julien.puydt@laposte.net>]

Control: retitle -1 ITP: scandir -- Better directory iterator that
returns all file info the OS provides

I would like to package python-scandir, as newer versions of
python-pathlib2 now depend on it.

As I don't want to add new deps to the python-pathlib2 package now, I'll
work in several steps :
- close this ITP bug by packaging scandir ;
- leave things as-is until stretch is out ;
- get newer python-pathlib2 out with a depend on python-scandir (thus
closing #851137).

For reference, that is a backport of the scandir in Python 3 ; I know
it's a wishlist item to stop packaging Python 2 modules, but since it's
a new dep of an existing one, I think it still makes sense.

Snark on #debian-python