Description of problem:
The changes reported in https://review.openstack.org/#/c/230764/ have been made in order to make the enabling of dhcp_agent,l3,agent,ovs_agent and metadata_agent, user configurable. The default has been set to "true" which will allow these services to come up. If a user wishes to disable them as a part of overcloud bringup, they can do so by specifying the heat template as shown in environments/neutron-core-config.yaml file.
These changes were made in the HA deployment code only.
These changes are a part of the overall deployment that Nuage Networks is working on.