[issue21305] PEP 466: update os.urandom

[STINNER Victor]

STINNER Victor added the comment:

> The problem is AFAICT there's currently no way to get a file
> descriptor to the underlying /dev/urandom (and I don't know how it
> works on Windows).

We can reimplement os.urandom in SystemRandom on UNIX to keep the file (fd)
open. The code is very simple, basically it's just a call to file.read(n).

Adding a randbytes() method in Python 3.5 would be nice.

The io module can handle boring things for you, like calling read in a loop
until you get enough bytes and handle InterruptError.

Except if you would prefer to use os.read or FileIO.read to avoid readahead.

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