Add ability to deploy Designate (DNSaaS)

This commit adds the ability for users to enable Designate (DNSaaS)
in a MNAIO build. This service is disabled by default.

Change-Id: I36e10922b6fe8e5cba3cc929e2b91b59507c210d

multi-node-aio/playbooks/group_vars/all.yml

@@ -152,6 +152,7 @@ osa_enable_identity: true
 osa_enable_block_storage: "{{ not (enable_ceph_storage | bool) }}"
 osa_enable_image: true
 osa_enable_lbaas: false
+osa_enable_dnsaas: false
 osa_enable_compute: true
 osa_enable_orchestration: true
 osa_enable_dashboard: true

multi-node-aio/playbooks/osa/openstack_user_config.yml

@@ -263,6 +263,11 @@ image_hosts: *infra_block
 octavia-infra_hosts: *infra_block
 {% endif %}
 
+{% if osa_enable_dnsaas | bool %}
+# designate
+dnsaas_hosts: *infra_block
+{% endif %}
+
 {% if osa_enable_compute | bool %}
 # nova api, conductor, etc services
 compute-infra_hosts: *infra_block

multi-node-aio/playbooks/osa/user_mnaio_variables.yml

@@ -73,6 +73,12 @@ cinder_backends:
 {% endraw %}
 {% endif %}
 
+{% if osa_enable_dnsaas | bool %}
+{% raw %}
+designate_galera_address: "{{ internal_lb_vip_address }}"
+{% endraw %}
+{% endif %}
+
 {% if osa_enable_elk_metrics | bool %}
 # NOTE(d34dh0r53): The disk detection to determine the logstash_queue_type
 # can fail spectacularly on an MNAIO so I'm hard setting it here to bypass