Fix broken deploy of placement service

Correct typo in role's playbook in order to be able to deploy
the service with customized policy file.

Change-Id: I252ffaf73dd2a649387ddacc73286b49f36dfdf2
Closes-Bug: #1948835

ansible/roles/placement/tasks/config.yml

@@ -104,7 +104,7 @@
   become: true
   template:
     src: "{{ placement_policy_file_path }}"
-    dest: "{{ placement_config_directory }}/{{ item.key }}/{{ placement_policy_file }}"
+    dest: "{{ node_config_directory }}/{{ item.key }}/{{ placement_policy_file }}"
     mode: "0660"
   when:
     - inventory_hostname in groups[item.value.group]

releasenotes/notes/bug-1948835-51b15ddbef04d307.yaml

+---
+fixes:
+  - |
+    Fixes an error in placement role which prevents to deploy the placement
+    service when custom policy file is used.
+    `LP#1948835 <https://bugs.launchpad.net/kolla-ansible/+bug/1948835>`__