Ensure that policy file has correct group/mode

When the policy file is copied from the templated
file to the active file, it loses its group/mode
settings. This patch ensures that they are properly
replicated during the copy.

Change-Id: I17c242bc0af72b839009fc2115d1ff940d4251cb

handlers/main.yml

@@ -66,6 +66,9 @@
   copy:
     src: "{{ neutron_conf_dir }}/policy.json-{{ neutron_venv_tag }}"
     dest: "{{ neutron_conf_dir }}/policy.json"
+    owner: "root"
+    group: "{{ neutron_system_group_name }}"
+    mode: "0640"
     remote_src: yes
 
 - name: Start services