oslo.policy 1.18.0 release

meta:version: 1.18.0
meta:diff-start: -
meta:series: ocata
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Joshua Harlow <jxharlow@godaddy.com>
meta:release:Commit: Joshua Harlow <jxharlow@godaddy.com>
meta:release:Change-Id: I5814deb5021621b05e88ff9c637869210f8eb2d8
meta:release:Code-Review+1: wanghongtaozz <wanghongtaozz@inspur.com>
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Workflow+1: Doug Hellmann <doug@doughellmann.com>
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