Fix Horizon's configmap to work with underscores

Change-Id: If668117d9c2b1eca42a2f5b7cede10bd22558c90
Partially-implements: blueprint fix-underscores-in-paths
Partially-implements: blueprint openstack-services

services/horizon/horizon-pod.yml.j2

@@ -14,7 +14,7 @@ spec:
           image: "{{ horizon_image_full }}"
           volumeMounts:
             - mountPath: {{ container_config_directory }}
-              name: horizon-config
+              name: horizon-configmap
           env:
             - name: KOLLA_CONFIG_STRATEGY
               value: {{ config_strategy }}
@@ -27,5 +27,12 @@ spec:
         - name: horizon-configmap
           configMap:
             name: horizon-configmap
+            items:
+            - key: horizon.conf
+              path: horizon.conf
+            - key: config.json
+              path: config.json
+            - key: local-settings
+              path: local_settings
 metadata:
    name: horizon