nova 16.0.4 release

meta:version: 16.0.4
meta:diff-start: -
meta:series: pike
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: I1fcdb578168a294dc7aef08bb4048bfaede8c156
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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