[Checkins] [zopefoundation/Zope] 4144a2: Do not quote `@` on redirect.

[Michael Howitz]

  Branch: refs/heads/fix-redirect- at -quoting
  Home:   https://github.com/zopefoundation/Zope
  Commit: 4144a2b6b5cca0587e5e4057cb19dedbe71d0004
      https://github.com/zopefoundation/Zope/commit/4144a2b6b5cca0587e5e4057cb19dedbe71d0004
  Author: Michael Howitz <mh at gocept.com>
  Date:   2019-05-03 (Fri, 03 May 2019)

  Changed paths:
    M src/ZPublisher/HTTPResponse.py
    M src/ZPublisher/tests/testHTTPResponse.py

  Log Message:
  -----------
  Do not quote `@` on redirect.

This is a regression introduced in zopefoundation/Zope#435.