[Checkins] [zopefoundation/Zope] 413422: Do not quote `@` on redirect. (#586)

[Michael Howitz]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/Zope
  Commit: 4134224ea6128c9158839248c81278c3a65b8f12
      https://github.com/zopefoundation/Zope/commit/4134224ea6128c9158839248c81278c3a65b8f12
  Author: Michael Howitz <mh at gocept.com>
  Date:   2019-05-07 (Tue, 07 May 2019)

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

  Log Message:
  -----------
  Do not quote `@` on redirect. (#586)

* Do not quote `@` on redirect.

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

* - next attempt at a fix

* - missed a character

* - remove unused import