python-openstackclient 4.0.0 release

meta:version: 4.0.0
meta:diff-start: -
meta:series: train
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Dean Troyer <dtroyer@gmail.com>
meta:release:Commit: Dean Troyer <dtroyer@gmail.com>
meta:release:Change-Id: I7773124f6c22bf2c58d3b02f0427a4d79c071090
meta:release:Code-Review+1: Akihiro Motoki <amotoki@gmail.com>
meta:release:Code-Review+2: Jean-Philippe Evrard <jean-philippe@evrard.me>
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Thierry Carrez <thierry@openstack.org>
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