nova 20.4.0 release

meta:version: 20.4.0
meta:diff-start: -
meta:series: train
meta:release-type: release
meta:pypi: no
meta:first: no
meta:release:Author: Előd Illés <elod.illes@est.tech>
meta:release:Commit: Előd Illés <elod.illes@est.tech>
meta:release:Change-Id: I7412c097fd64f468dd9d1d59c3b83513f090167b
meta:release:Code-Review+2: Hervé Beraud <hberaud@redhat.com>
meta:release:Code-Review+1: Balazs Gibizer <balazs.gibizer@est.tech>
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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