Include subnet in unbound colloc port creation to ensure IP allocation

In some deployments, it seems that the port doesn't get an IP address
unless you specify the desired subnet.

Change-Id: I2ef8d56bb46bdd9c1ded6deadc3d3f72ec7722f5

deployment/unbound/unbound-container-ansible.yaml

@@ -165,6 +165,19 @@ outputs:
             - step|int == 1
             - unbound_listen_ips|length == 0
           block:
+            - name: Get the subnet id for the proper network
+              openstack.cloud.subnets_info:
+                name:
+                  if:
+                    - public_net_is_ctlplane
+                    - ctlplane_subnet
+                    -
+                      str_replace:
+                        template:
+                          "$NETWORK_subnet"
+                        params:
+                          $NETWORK: {get_param: [ServiceNetMap, PublicNetwork] }
+              register: subnet_info
             - name: Create a neutron port for a new address
               os_port:
                 state: present
@@ -173,6 +186,10 @@ outputs:
                     - public_net_is_ctlplane
                     - 'ctlplane'
                     - { get_param: [ServiceNetMap, PublicNetwork] }
+                # NOTE(beagles): Seems to be required for some deployments to make sure
+                # port gets an IP address.
+                fixed_ips:
+                  - subnet_id: "{{ subnet_info.openstack_subnets[0].id }}"
                 no_security_groups: True
                 name: "unbound-designate-{{ item }}-integration-port"
               register: _unbound_designate_ports