Upgrade OpenStack to version Zed

OpenStack needs to be upgraded to Yoga first (!1576 (merged))

The following releases notes are relevant:

• https://docs.openstack.org/releasenotes/oslo.messaging/zed.html
• https://docs.openstack.org/releasenotes/neutron/zed.html
• https://docs.openstack.org/releasenotes/nova/zed.html
• https://docs.openstack.org/releasenotes/octavia/zed.html
• https://docs.openstack.org/releasenotes/cinder/zed.html
• https://docs.openstack.org/releasenotes/designate/zed.html
• https://docs.openstack.org/releasenotes/designate/zed.html
• https://docs.openstack.org/releasenotes/horizon/zed.html
• https://docs.openstack.org/releasenotes/keystone/zed.html
• https://docs.openstack.org/releasenotes/kolla-ansible/zed.html