oslo.utils 3.18.0 release

meta:version: 3.18.0
meta:diff-start: -
meta:series: ocata
meta:release-type: release
meta:announce: openstack-dev@lists.openstack.org
meta:pypi: yes
meta:first: no
meta:release:Author: Victor Stinner <vstinner@redhat.com>
meta:release:Commit: Victor Stinner <vstinner@redhat.com>
meta:release:Change-Id: Icc6369ef8705f0dffe3a079a9e565f4952221897
meta:release:Code-Review+1: John Eckersberg <jeckersb@redhat.com>
meta:release:Code-Review+2: Davanum Srinivas (dims) <davanum@gmail.com>
meta:release:Workflow+1: Davanum Srinivas (dims) <davanum@gmail.com>
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