D890: urllibcompat: new library to help abstract out some python3 urllib2 stuff

[yuja (Yuya Nishihara)]

yuja requested changes to this revision.
yuja added a comment.
This revision now requires changes to proceed.


  Please add GPL boilerplate.
  
  FWIW, we might want to move some urllib-related hacks from pycompat.py.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D890

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