On SSL enabled overcloud the novnc URL gets configured with http protocol instead of https

Description of problem:
On SSL enabled overcloud the novnc URL gets configured with http protocol instead of https:

source ~/stackrc
export THT=/usr/share/openstack-tripleo-heat-templates
openstack overcloud deploy --templates \
-e $THT/environments/network-isolation.yaml \
-e $THT/environments/network-management.yaml \
-e ~/templates/network-environment.yaml \
-e $THT/environments/storage-environment.yaml \
-e ~/templates/disk-layout.yaml \
-e ~/templates/wipe-disk-env.yaml \
-e ~/templates/enable-tls.yaml \
-e ~/templates/inject-trust-anchor.yaml \
-e ~/templates/tls-endpoints-public-ip.yaml \
-e ~/templates/ssl-ports.yaml \
--control-scale 3 \
--control-flavor controller \
--compute-scale 1 \
--compute-flavor compute \
--ceph-storage-scale 1 \
--ceph-storage-flavor ceph \
--ntp-server clock.redhat.com \
--log-file overcloud_deployment.log &> overcloud_install.log

Version-Release number of selected component (if applicable):
openstack-tripleo-heat-templates-5.0.0-0.20160823140311.72404b.1.el7ost.noarch

How reproducible:
100%

Steps to Reproduce:
1. Deploy SSL enabled overcloud
2. Launch instance
3. nova get-vnc-console st--89-instance-uayoipreamyl-my_instance-igz4chfjp4u4 novnc

Actual results:
+-------+-----------------------------------------------------------------------------------+
| Type | Url |
+-------+-----------------------------------------------------------------------------------+
| novnc | http://172.16.18.25:6080/vnc_auto.html?token=5060af06-5c0f-4267-8203-0f51785c5e1c |
+-------+-----------------------------------------------------------------------------------+

Expected results:
URL is https://172.16.18.25:6080

Additional info:
This is caused by a misconfiguration in /etc/nova/nova.conf on the compute node:

[root@overcloud-novacompute-0 heat-admin]# grep novnc /etc/nova/nova.conf
novncproxy_base_url=http://172.16.18.25:6080/vnc_auto.html