[PATCH V4] posix: update os.popen with subprocess (issue4746)

[Yuya Nishihara]

On Sat, 04 Mar 2017 12:49:43 +0530, Rishabh Madan wrote:
> # HG changeset patch
> # User Rishabh Madan <rishabhmadan96 at gmail.com>
> # Date 1488611777 -19800
> #      Sat Mar 04 12:46:17 2017 +0530
> # Node ID 99a468ebed64e08a157fdad1333e44103886130d
> # Parent  71f692f1f678d86ffb4f95a3621aacfdaeb96b05
> posix: update os.popen with subprocess (issue4746)

I've dropped this from patchwork per the review for V3.