Template custom HAProxy service configuration

Change Id84e3b6e62e544582d6917047534e846e026798d added support for
custom HAProxy service config using a plain copy of files in services.d.

Use a template action instead of a copy so that we can use variables and
iterate over group of hosts.

Change-Id: I1f07785932de4e4540422bd18af95241f05a67bf

ansible/roles/haproxy/tasks/config.yml

@@ -70,7 +70,7 @@
 - name: Copying over custom haproxy services configuration
   vars:
     service: "{{ haproxy_services['haproxy'] }}"
-  copy:
+  template:
     src: "{{ item }}"
     dest: "{{ node_config_directory }}/haproxy/services.d/"
     mode: "0660"