ceilometer: use template for custom pipeline.yaml

Also rename task to "Copying over custom pipeline.yaml file" for
clarity.

Change-Id: I04e3eb9620830a15781f9bab2549b557a9d1d9cb

ansible/roles/ceilometer/tasks/config.yml

@@ -296,13 +296,13 @@
   delegate_to: localhost
   register: ceilometer_pipeline_file
 
-- name: Copying over pipeline.yaml
+- name: Copying over custom pipeline.yaml file
   vars:
     services_require_pipeline:
       - ceilometer-compute
       - ceilometer-central
       - ceilometer-notification
-  copy:
+  template:
     src: "{{ node_custom_config }}/ceilometer/pipeline.yaml"
     dest: "{{ node_config_directory }}/{{ item.key }}/pipeline.yaml"
     force: True

releasenotes/notes/ceilometer-pipeline-yaml-as-template-8319d7fdeacd15f1.yaml

+---
+features:
+  - |
+    The ``ceilometer/pipeline.yaml`` file is now handled as a template
+    file.