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: If7ed1c8281d3e78c5905ccc570456e998d191370

tasks/sahara_post_install.yml

@@ -12,7 +12,7 @@
 # limitations under the License.
 
 - name: Drop Sahara Config(s)
-  config_template:
+  openstack.config_template.config_template:
     src: "{{ item.src }}"
     dest: "{{ item.dest }}"
     owner: "{{ sahara_system_user_name }}"
@@ -40,7 +40,7 @@
     - Restart uwsgi services
 
 - name: Implement policy.yaml if there are overrides configured
-  config_template:
+  openstack.config_template.config_template:
     content: "{{ sahara_policy_overrides }}"
     dest: "/etc/sahara/policy.yaml"
     owner: "{{ sahara_system_user_name }}"