Feature: Add creation of a management network to the network isolation tripleo-heat-templates as well as a port on that network for all overcloud nodes. Reason: This network is to be used for administrative access to the overcloud nodes. Result: In https://review.openstack.org/#/c/264963 "Add Management Network For System Administration." (included in openstack-tripleo-heat-templates-0.8.10-1.el7ost) a new environment file "network-management.yaml" is introduced, which can be used when deploying your overcloud to enable creation of the management network/subnets and ports on each node. As well as this new environment file you will also need to ensure the management network is created correctly by your network templates. If you are deploying with the existing (in-tree) example templates, like the "single-nic-vlans" or "multiple-nics" you will need to uncomment the provided block - see https://github.com/openstack/tripleo-heat-templates/blob/365c35cc6e1e588215ab6d63143b84bb56dce376/network/config/single-nic-vlans/controller.yaml#L140 as an example, assuming you are using the single-nic-vlans templates and wish to create the management network vlan.