neutron 8.4.0 release

meta:version: 8.4.0
meta:diff-start: -
meta:series: mitaka
meta:release-type: release
meta:pypi: no
meta:first: no
meta:release:Author: Dariusz Smigiel <smigiel.dariusz@gmail.com>
meta:release:Commit: Dariusz Smigiel <smigiel.dariusz@gmail.com>
meta:release:Change-Id: I1acbe25aa0c064597dfc0d6910d27dc9becd004f
meta:release:Code-Review+1: Ihar Hrachyshka <ihrachys@redhat.com>
meta:release:Code-Review+2: Tony Breeds <tony@bakeyournoodle.com>
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Workflow+1: Doug Hellmann <doug@doughellmann.com>
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