Upgrade OpenStack to version Yoga

The following releases notes are relevant:

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

TODO after upgrade:

• migrate ElasticSearch to OpenSearch (can be done when upgrading to Zed)
• Switch om_enable_rabbitmq_high_availability to true, follow the migration instructions (can be done after last OpenStack upgrade)
• Maybe set rabbitmq_ha_promote_on_shutdown to always as recommended in release note (needs previous setting)