Add ServiceNetMap to global_vars

This adds the ServiceNetMap value to global_vars for config-download.
This will make the value consumable from ansible tasks when running
config-download.

Additional values can be added in a similar fashion in the future to
allow for less hardcoded data coming out of Heat, and instead using
jinja expressions to consume data from Ansible variables when
config-download runs.

Change-Id: I8c442caac140f1c96123c1be47e858949419fd8f

common/deploy-steps.j2

@@ -110,6 +110,10 @@ parameters:
     type: number
     default: {{role.CountDefault|default(0)}}
 {% endfor %}
+  ServiceNetMapLower:
+    description: Mapping of service name to network name
+    type: json
+    default: {}
 
 conditions:
 {% for role in enabled_roles %}
@@ -237,6 +241,7 @@ outputs:
       global_vars:
         deploy_steps_max: {{deploy_steps_max}}
         ssh_known_hosts: {get_param: ssh_known_hosts_hostnames}
+        service_net_map: {get_param: ServiceNetMapLower}
       common_deploy_steps_tasks: {get_file: deploy-steps-tasks.yaml}
       docker_puppet_script: {get_file: ./container-puppet.py}
       deploy_steps_playbook:

overcloud.j2.yaml

@@ -1036,6 +1036,7 @@ resources:
 {%- for role in roles %}
       {{role.name}}Count: {get_param: {{role.name}}Count}
 {%- endfor %}
+      ServiceNetMapLower: {get_attr: [ServiceNetMap, service_net_map_lower]}
 
   ServerOsCollectConfigData:
     type: OS::Heat::Value