cliff 2.6.0 release

meta:version: 2.6.0
meta:diff-start: -
meta:series: pike
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Stephen Finucane <sfinucan@redhat.com>
meta:release:Commit: Dean Troyer <dtroyer@gmail.com>
meta:release:Change-Id: I3170e7ab135ffa323aa322bce18b296f822dd575
meta:release:Code-Review+1: Dean Troyer <dtroyer@gmail.com>
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Thierry Carrez <thierry@openstack.org>
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