python-novaclient 15.0.0 release

meta:version: 15.0.0
meta:diff-start: -
meta:series: train
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Matt Riedemann <mriedem.os@gmail.com>
meta:release:Commit: Matt Riedemann <mriedem.os@gmail.com>
meta:release:Change-Id: I067e21cd3b33eb77850afc30ab9557d435c5d800
meta:release:Code-Review+1: Eric Fried <openstack@fried.cc>
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Code-Review+1: Brin Zhang <zhangbailin@inspur.com>
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Thierry Carrez <thierry@openstack.org>
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