Comment 5 for bug 1897592

I'm not sure about the usecase here, but we can override one endpoint like[1] or add an additional endpoint as we do map_merge[2].

[1]
parameter_defaults:
  EndpointMapOverride:
    AodhAdmin:
      host: 172.16.13.50
      host_nobrackets: 172.16.13.50
      port: 8042
      protocol: http
      uri: http://172.16.13.50:8042
      uri_no_suffix: http://172.16.13.50:8042

[2] https://github.com/openstack/tripleo-heat-templates/blob/master/overcloud.j2.yaml#L604-L606