Only copy the necessary config files for Glance

Only copy the necessary config files when it _really_ needed. This
will make the config file safer

Partial-Bug: #1559122
Change-Id: I5f5df54c688fb4f6b0ee68815116e2418d5742f7

ansible/roles/glance/tasks/config.yml

 ---
 - name: Ensuring config directories exist
   file:
-    path: "{{ node_config_directory }}/{{ item }}"
+    path: "{{ node_config_directory }}/{{ item.service }}"
     state: "directory"
     recurse: yes
+  when: inventory_hostname in groups[item.group]
   with_items:
-    - "glance-api"
-    - "glance-registry"
+    - { service: glance-api, group: glance-api }
+    - { service: glance-registry, group: glance-registry }
 
 - name: Copying over config.json files for services
   template:
-    src: "{{ item }}.json.j2"
-    dest: "{{ node_config_directory }}/{{ item }}/config.json"
+    src: "{{ item.service }}.json.j2"
+    dest: "{{ node_config_directory }}/{{ item.service }}/config.json"
+  when: inventory_hostname in groups[item.group]
   with_items:
-    - "glance-api"
-    - "glance-registry"
+    - { service: glance-api, group: glance-api }
+    - { service: glance-registry, group: glance-registry }
 
 - name: Copying over glance-*.conf
   merge_configs:
     vars:
-      service_name: "{{ item }}"
+      service_name: "{{ item.service }}"
     sources:
-      - "{{ role_path }}/templates/{{ item }}.conf.j2"
+      - "{{ role_path }}/templates/{{ item.service }}.conf.j2"
       - "/etc/kolla/config/global.conf"
       - "/etc/kolla/config/database.conf"
       - "/etc/kolla/config/messaging.conf"
       - "/etc/kolla/config/glance.conf"
-      - "/etc/kolla/config/glance/{{ item }}.conf"
-      - "/etc/kolla/config/glance/{{ inventory_hostname }}/{{ item }}.conf"
-    dest: "{{ node_config_directory }}/{{ item }}/{{ item }}.conf"
+      - "/etc/kolla/config/glance/{{ item.service }}.conf"
+      - "/etc/kolla/config/glance/{{ inventory_hostname }}/{{ item.service }}.conf"
+    dest: "{{ node_config_directory }}/{{ item.service }}/{{ item.service }}.conf"
+  when: inventory_hostname in groups[item.group]
   with_items:
-    - "glance-api"
-    - "glance-registry"
+    - { service: glance-api, group: glance-api }
+    - { service: glance-registry, group: glance-registry }
+