Description of problem:
Haproxy config for nova metadata uses ctlplane ip addresses instead of internal_api when using network isolation:

[root@overcloud-controller-0 heat-admin]# grep -A5 metadata /etc/haproxy/haproxy.cfg
listen nova_metadata
  bind 192.168.0.15:8775 transparent
  server overcloud-controller-0 192.168.0.18:8775 check fall 5 inter 2000 rise 2
  server overcloud-controller-1 192.168.0.14:8775 check fall 5 inter 2000 rise 2
  server overcloud-controller-2 192.168.0.17:8775 check fall 5 inter 2000 rise 2

The endpointmap shows the NovaMetadataNetwork is set to internal_api:

[stack@undercloud ~]$ openstack stack show overcloud-EndpointMap-traer4nttfk2 | grep NovaMetadataNetwork
WARNING: openstackclient.common.utils is deprecated and will be removed after Jun 2017. Please use osc_lib.utils
| | u''NovaMetadataNetwork'': u''internal_api'', u''AodhApiNetwork'': u''internal_api'',

But on the controller nodes there's not hieradata which sets the addresses to the internal_api network:

[root@overcloud-controller-0 modules]# hiera nova_metadata_vip
nil

[root@overcloud-controller-0 modules]# hiera nova_metadata_node_ips
nil

The deploy command:

source ~/stackrc
export THT=~/templates/tripleo-heat-templates/
openstack overcloud deploy --templates $THT \
-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 $THT/environments/puppet-pacemaker.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 \
--libvirt-type qemu

[stack@undercloud ~]$ cat templates/network-environment.yaml
resource_registry:
  OS::TripleO::Compute::Net::SoftwareConfig: /home/stack/templates/nic-configs/compute.yaml
  OS::TripleO::Controller::Net::SoftwareConfig: /home/stack/templates/nic-configs/controller.yaml
  OS::TripleO::CephStorage::Net::SoftwareConfig: /home/stack/templates/nic-configs/ceph-storage.yaml

parameter_defaults:

  InternalApiNetCidr: 10.0.0.0/25
  InternalApiAllocationPools: [{'start': '10.0.0.10', 'end': '10.0.0.100'}]
  InternalApiNetworkVlanID: 200

  StorageNetCidr: 10.0.0.128/25
  StorageAllocationPools: [{'start': '10.0.0.138', 'end': '10.0.0.200'}]
  StorageNetworkVlanID: 300

  StorageMgmtNetCidr: 10.0.1.0/25
  StorageMgmtAllocationPools: [{'start': '10.0.1.10', 'end': '10.0.1.100'}]
  StorageMgmtNetworkVlanID: 301

  TenantNetCidr: 10.0.1.128/25
  TenantAllocationPools: [{'start': '10.0.1.138', 'end': '10.0.1.200'}]

  ManagementNetCidr: 172.16.17.128/25
  ManagementAllocationPools: [{'start': '172.16.17.160', 'end': '172.16.17.200'}]

  ExternalNetCidr: 172.16.18.0/25
  ExternalAllocationPools: [{'start': '172.16.18.25', 'end': '172.16.18.100'}]
  ExternalInterfaceDefaultRoute: 172.16.18.126
  ExternalNetworkVlanID: 100

  ControlPlaneSubnetCidr: "25"
  ControlPlaneDefaultRoute: 192.168.0.1

  EC2MetadataIp: 192.168.0.1
  DnsServers: ["10.16.36.29","10.11.5.19"]

  NeutronExternalNetworkBridge: "''"
  NeutronBridgeMappings: 'datacentre:br-ex,tenantvlan:br-infra'
  NeutronEnableIsolatedMetadata: 'True'
  NeutronNetworkType: 'vxlan,gre,vlan,flat'
  NeutronTunnelTypes: 'vxlan,gre'
  NeutronNetworkVLANRanges: 'datacentre:100:199,tenantvlan:200:299'
  NeutronGlobalPhysnetMtu: 1496

Version-Release number of selected component (if applicable):
openstack-tripleo-heat-templates-5.0.0-0.20160907212643.90c852e.1.el7ost.noarch

How reproducible:
100%