[kolla] Kayobe 7.0.0 released for Train

Hi, I'm pleased to announce the release of Kayobe 7.0.0 - the first release in the Train series, and the first release as a deliverable of the Kolla project. Full details are available in the release notes which are available here: https://docs.openstack.org/releasenotes/kayobe/train.html We anticipate significant changes during the Train release series to support a migration to CentOS 8. We will communicate which releases are affected. Thanks to everyone who contributed to this release, and for the Kolla project for accepting us. I look forward to the continued integration of these teams. Cheers, Mark