Add config_template to OpenStack-Ansible

The config_template is curated by the OpenStack-Ansible group
until we find out a better place, or there are more people
interested by it.

Depends-On: https://review.openstack.org/#/c/546678/
Change-Id: I7cbf22fff1c483f23c59cae4d9e6669f4c857f04

reference/projects.yaml

@@ -2449,6 +2449,9 @@ OpenStackAnsible:
     while also being simple to operate, upgrade, and grow.
   url: https://wiki.openstack.org/wiki/OpenStackAnsible
   deliverables:
+    ansible-config_template:
+      repos:
+        - openstack/ansible-config_template
     openstack-ansible:
       repos:
         - openstack/ansible-hardening