Enable nova VNC configuration on the subnode

The n-novnc service only runs on the controller node, however novnc
settings must be enabled on both nodes for vnc to work, since both
hosts are compute hosts.

Change-Id: Icc29441f507e6e4df9fd900eb7f35b0862f52043

Author: afrittoli

.zuul.yaml

@@ -277,7 +277,7 @@
         DEBUG_LIBVIRT_COREDUMPS: True
         NOVA_VNC_ENABLED: true
         VNCSERVER_LISTEN: 0.0.0.0
-        VNCSERVER_PROXYCLIENT_ADDRESS: "{{ hostvars[inventory_hostname]['nodepool']['private_ipv4'] }}"
+        VNCSERVER_PROXYCLIENT_ADDRESS: $HOST_IP
       devstack_local_conf:
         post-config:
           $NEUTRON_CONF:
@@ -371,6 +371,9 @@
           # Subnode specific settings
           GLANCE_HOSTPORT: "{{ hostvars['controller']['nodepool']['private_ipv4'] }}:9292"
           Q_HOST: "{{ hostvars['controller']['nodepool']['private_ipv4'] }}"
+          NOVA_VNC_ENABLED: true
+          VNCSERVER_LISTEN: 0.0.0.0
+          VNCSERVER_PROXYCLIENT_ADDRESS: $HOST_IP
 
 - job:
     name: devstack-multinode