oslo.policy 1.28.0 release

meta:version: 1.28.0
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: I3d18b4891298a44498e4a9558b4a2bd461f1961e
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Workflow+1: Doug Hellmann <doug@doughellmann.com>
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