cliff 3.8.0 release

meta:version: 3.8.0
meta:diff-start: -
meta:series: xena
meta:release-type: release
meta:pypi: yes
meta:first: yes
meta:release:Author: Hervé Beraud <hberaud@redhat.com>
meta:release:Commit: Hervé Beraud <hberaud@redhat.com>
meta:release:Change-Id: I8d3c3c932dc5c91f5e0476e14030124307991ae2
meta:release:Code-Review+1: Artem Goncharov <artem.goncharov@gmail.com>
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Code-Review+2: Hervé Beraud <herveberaud.pro@gmail.com>
meta:release:Workflow+1: Hervé Beraud <herveberaud.pro@gmail.com>
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