ci-multinode: Add internal interface to seed

This is required for StackHPC OpenStack tests to access OpenSearch and Prometheus.

Author: markgoddard

etc/kayobe/environments/ci-multinode/inventory/group_vars/seed/network-interfaces

@@ -4,6 +4,8 @@
 
 admin_oc_interface: "{{ ansible_facts.default_ipv4.interface }}"
 
+internal_interface: "{{ vxlan_interfaces[0].device }}.{{ internal_vlan }}"
+
 provision_oc_interface: "{{ vxlan_interfaces[0].device}}.{{ provision_oc_vlan }}"
 
 external_interface: "{{ vxlan_interfaces[0].device }}.{{ external_vlan }}"

etc/kayobe/environments/ci-multinode/seed.yml

@@ -3,14 +3,18 @@ seed_bootstrap_user: "{{ os_distribution if os_distribution == 'ubuntu' else 'cl
 seed_lvm_groups:
   - "{{ stackhpc_lvm_group_rootvg }}"
 
-seed_extra_network_interfaces: "{{ seed_extra_network_interfaces_external + (seed_extra_network_interfaces_manila if (kolla_enable_manila | bool and kolla_enable_manila_backend_cephfs_native | bool) else []) }}"
+seed_extra_network_interfaces: "{{ seed_extra_network_interfaces_external + seed_extra_network_interfaces_internal + (seed_extra_network_interfaces_manila if (kolla_enable_manila | bool and kolla_enable_manila_backend_cephfs_native | bool) else []) }}"
 
 # Seed has been provided an external interface
 # for tempest tests and SSH access to machines.
 seed_extra_network_interfaces_external:
   - "external"
   - "public"
 
+# Seed has been provided an internal API interface for StackHPC OpenStack tests.
+seed_extra_network_interfaces_internal:
+  - "internal"
+
 # Seed requires access to the storage network for manila-cephfs.
 seed_extra_network_interfaces_manila:
   - "storage"