oslo.context 2.19.1 release

meta:version: 2.19.1
meta:diff-start: -
meta:series: queens
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Sean McGinnis <sean.mcginnis@huawei.com>
meta:release:Commit: Sean McGinnis <sean.mcginnis@huawei.com>
meta:release:Change-Id: I828398197705b6dd0eeb657d56bd140c1aa5a1a5
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Thierry Carrez <thierry@openstack.org>
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