neutron-vpnaas 28.0.0.0rc1 release candidate

meta:version: 28.0.0.0rc1
meta:team: neutron
meta:diff-start: -
meta:series: gazpacho
meta:branch: master
meta:release-type: release candidate
meta:pypi: no
meta:first: no
meta:release:Author: Elod Illes <elod.illes@est.tech>
meta:release:Commit: Slawek Kaplonski <skaplons@redhat.com>
meta:release:Change-Id: Ib61afecd2a4d6d57121abab1bcaf3a8f182f09b6
meta:release:Code-Review+1: Slawek Kaplonski <skaplons@redhat.com>
meta:release:Code-Review+1: Rodolfo Alonso <ralonsoh@redhat.com>
meta:release:Code-Review+2: Elod Illes <elod.illes@est.tech>
meta:release:Workflow+1: Elod Illes <elod.illes@est.tech>
meta:release:Code-Review+1: Lajos Katona <katonalala@gmail.com>