python-heatclient 1.18.0 release

meta:version: 1.18.0
meta:diff-start: -
meta:series: train
meta:release-type: release
meta:pypi: yes
meta:first: yes
meta:release:Author: Thierry Carrez <thierry@openstack.org>
meta:release:Commit: Thierry Carrez <thierry@openstack.org>
meta:release:Change-Id: Icc057b1b9e02232fa45f012da7c6b6aee73cf1a5
meta:release:Code-Review+1: Rico Lin <rico.lin.guanyu@gmail.com>
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Workflow+1: Sean McGinnis <sean.mcginnis@gmail.com>
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