[Checkins] [zopefoundation/Zope] 260385: Follow-up to #199, don't use `wsgi.handleErrors`.

[GitHub]

  Branch: refs/heads/plone-fixes
  Home:   https://github.com/zopefoundation/Zope
  Commit: 2603856fc79012adca461c2f655c13d71027e08f
      https://github.com/zopefoundation/Zope/commit/2603856fc79012adca461c2f655c13d71027e08f
  Author: Hanno Schlichting <hanno at hannosch.eu>
  Date:   2017-10-19 (Thu, 19 Oct 2017)

  Changed paths:
    M src/Testing/ZopeTestCase/functional.py
    M src/Testing/ZopeTestCase/zopedoctest/functional.py
    M src/ZPublisher/WSGIPublisher.py
    M src/ZPublisher/tests/test_WSGIPublisher.py

  Log Message:
  -----------
  Follow-up to #199, don't use `wsgi.handleErrors`.

Also fix `zopedoctest.functional.http` to support binary bodies.