Do not remove policy.yaml file

oslo.policy can not handle policy file removal. As a result, if policy
overrides were defined at some point, but then removed, causes service
outage.

While we could add a handler trigger to restart the service
on policy removal, it's better to simplify the logic and always place an
empty policy.yaml even if no overrides are defined.

Change-Id: I3d908eb861b5026d14437780264ec7422646f49f
Signed-off-by: Dmitriy Rabotyagov <dmitriy.rabotyagov@cleura.com>

tasks/barbican_post_install.yml

@@ -39,7 +39,7 @@
     - Restart barbican services
     - Restart uwsgi services
 
-- name: Implement policy.yaml if there are overrides configured
+- name: Place policy.yaml file
   openstack.config_template.config_template:
     content: "{{ barbican_policy_overrides }}"
     dest: "{{ barbican_etc_directory }}/policy.yaml"
@@ -47,20 +47,9 @@
     group: "{{ barbican_system_group_name }}"
     mode: "0640"
     config_type: yaml
-  when:
-    - barbican_policy_overrides | length > 0
   tags:
     - barbican-policy-override
 
-- name: Remove legacy policy.yaml file
-  ansible.builtin.file:
-    path: "{{ barbican_etc_directory }}/policy.yaml"
-    state: absent
-  tags:
-    - barbican-policy-override
-  when:
-    - barbican_policy_overrides | length == 0
-
 - name: Copy user defined libraries
   when: barbican_user_libraries | length > 0
   block: