Comment 2 for bug 1432742

@Miguel Alejandro Cantu (miguel-cantu) - when you have time might you be able to respond to Miguel Grinberg (miguelgrinberg) regarding the architecture and the reasoning for the change?

As a side note in master this can be set on a per deployment basis using user_variables.yml and adding in an entry for:
heat_metadata_server_url: "{{ heat_service_proto }}://{{ external_lb_vip_address }}:{{ heat_cfn_service_port }}"

Does this solve the issue without changing the default?