[Bug 1711573] Fix included in openstack/oslo.middleware 3.23.3

[OpenStack Infra]

This issue was fixed in the openstack/oslo.middleware 3.23.3 release.

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https://bugs.launchpad.net/bugs/1711573

Title:
  Invalid parsing of Forwarded header (RFC7239)

Status in Ubuntu Cloud Archive:
  Fix Committed
Status in Ubuntu Cloud Archive ocata series:
  Triaged
Status in Ubuntu Cloud Archive pike series:
  Fix Committed
Status in oslo.middleware:
  Fix Released
Status in python-oslo.middleware package in Ubuntu:
  Fix Released
Status in python-oslo.middleware source package in Zesty:
  Fix Committed
Status in python-oslo.middleware source package in Artful:
  Fix Released

Bug description:
  >>> from oslo_middleware.http_proxy_to_wsgi import HTTPProxyToWSGI
  >>> HTTPProxyToWSGI._parse_rfc7239_header("for=192.0.2.60;proto=http, for=192.0.2.60;by=203.0.113.43")
  [{'for': '192.0.2.60', 'proto': 'http'}, {' for': '192.0.2.60', 'by': '203.0.113.43'}]
  >>>
  >>> HTTPProxyToWSGI._parse_rfc7239_header("for=192.0.2.60; proto=http, for=192.0.2.60; by=203.0.113.43")
  [{' proto': 'http', 'for': '192.0.2.60'}, {' for': '192.0.2.60', ' by': '203.0.113.43'}]

  According to some sources:
  https://en.wikipedia.org/wiki/X-Forwarded-For#Alternatives_and_variations
  https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Forwarded

  using space after semicolon in Forwarded header is valid, but
  _parse_rfc7239_header does not parse it properly: note spaces in keys
  in the dict above.

  This affects e.g. Heat when using a proxy+SSL.

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