oslo.concurrency 2.6.1 release

meta:version: 2.6.1
meta:series: liberty
meta:release-type: release
meta:announce: openstack-dev@lists.openstack.org
meta:pypi: no
meta:first: no
meta:release:Author: Victor Stinner <vstinner@redhat.com>
meta:release:Commit: Davanum Srinivas <davanum@gmail.com>
meta:release:Change-Id: If6541215438f92139a9ced2cbf5b2bd4cfe41546
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