oslo.context 2.19.3 release

meta:version: 2.19.3
meta:diff-start: -
meta:series: queens
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: ChangBo Guo(gcb) <eric.guo@easystack.cn>
meta:release:Commit: ChangBo Guo(gcb) <eric.guo@easystack.cn>
meta:release:Change-Id: I355836b0c1b4a74960994df8db7362662b4e443e
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Workflow+1: Doug Hellmann <doug@doughellmann.com>
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