Use templates for keystone domain specific configurations

Change-Id: Idb40cbed763382bef9965c6b090e71156b671590

ansible/roles/keystone/tasks/config.yml

@@ -73,7 +73,7 @@
 - name: Copying Keystone Domain specific settings
   vars:
     keystone: "{{ keystone_services.keystone }}"
-  copy:
+  template:
     src: "{{ item.path }}"
     dest: "{{ node_config_directory }}/keystone/domains/"
   register: keystone_domains