Revision 1884484

Merge r1883337 from trunk:

 * r1883337
   Remove uses of os.dup2() from run_tests.py in order to adapt the new
   console reader and writer on Windows since Python 3.6.
   Justification:
     PYTHONLEGACYWINDOWSSTDIO is no longer needed to run unit tests on Windows.
   Votes:
     +1: jun66j5, jcorvel