swift 2.18.0 release

meta:version: 2.18.0
meta:diff-start: -
meta:series: rocky
meta:release-type: release
meta:pypi: no
meta:first: yes
meta:release:Author: John Dickinson <me@not.mn>
meta:release:Commit: John Dickinson <me@not.mn>
meta:release:Change-Id: I9ebca4416833c46b53a58a3ca00539f66d3799f1
meta:release:Code-Review+1: Kota Tsuyuzaki <tsuyuzaki.kota@lab.ntt.co.jp>
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Thierry Carrez <thierry@openstack.org>
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