nova 15.0.4 release

meta:version: 15.0.4
meta:diff-start: -
meta:series: ocata
meta:release-type: release
meta:pypi: no
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: I230a929bf7d3244c15412121856d6ee5f745fbd7
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Code-Review+2: Alan Pevec <alan.pevec@redhat.com>
meta:release:Workflow+1: Alan Pevec <alan.pevec@redhat.com>
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