D2295: py3: get bytes-repr of network errors portably

[yuja (Yuya Nishihara)]

yuja added a comment.


  Here the exception type is limited, so using `bytestr()` should be okay.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D2295

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