python-swiftclient 4.0.0 release

meta:version: 4.0.0
meta:diff-start: -
meta:series: zed
meta:release-type: release
meta:pypi: yes
meta:first: yes
meta:release:Author: Hervé Beraud <hberaud@redhat.com>
meta:release:Commit: Hervé Beraud <herveberaud.pro@gmail.com>
meta:release:Change-Id: I556b217d7a9030e6c5abb5e9789ed1bc8d8edda0
meta:release:Code-Review+2: Elod Illes <elod.illes@est.tech>
meta:release:Workflow+1: Elod Illes <elod.illes@est.tech>
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