D3349: tests: make sure test-run-tests.t actually runs run-tests.py under Python 3

[indygreg (Gregory Szorc)]

indygreg accepted this revision.
indygreg added a comment.
This revision is now accepted and ready to land.


  *facepalm*

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D3349

To: durin42, #hg-reviewers, indygreg
Cc: indygreg, mercurial-devel