Fix Neutron DNS domain

Author: Alex-Welsh

etc/kayobe/environments/ci-multinode/kolla/globals.yml

@@ -42,6 +42,8 @@ nova_backend_ceph: "yes"
 neutron_bridge_name: "{{ vxlan_interfaces[0].device }}-ovs"
 neutron_external_interface: "{{ vxlan_interfaces[0].device }}"
 
+neutron_dns_domain: "{{ root_domain }}."
+
 # OpenSearch memory tuning
 opensearch_heap_size: 1g