Use config_template as a collection

Since we still use ceph-ansible that has their own implementation of
config_template module it's worth to use mentioned module as a collection
explicitly.

Depends-On: https://review.opendev.org/c/openstack/openstack-ansible/+/819814



Change-Id: I649c5d02b9c909a3339799711a4a7816381a6626

tasks/horizon_post_install.yml

@@ -49,7 +49,7 @@
   register: _horizon_policy
 
 - name: Place policy overrides
-  config_template:
+  openstack.config_template.config_template:
     content: "{{ item.content | b64decode }}"
     dest: "{{ item.source }}"
     mode: "0644"