tooz 2.8.0 release

meta:version: 2.8.0
meta:diff-start: -
meta:series: wallaby
meta:release-type: release
meta:pypi: yes
meta:first: yes
meta:release:Author: Daniel Bengtsson <dbengt@redhat.com>
meta:release:Commit: Daniel Bengtsson <dbengt@redhat.com>
meta:release:Change-Id: I2a3b3766077c792924f203f95107e3b427bebaf0
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Workflow+1: Sean McGinnis <sean.mcginnis@gmail.com>
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