Deprecate openstack/openstack-ansible-tests repository

With following deprecation policy it is proposed to remove the project
from requirements sync process.

Change-Id: I081e45f7df07bba2c6302bb87b50d39e47a4ba1f

Author: Dmitriy Rabotyagov

projects.txt

@@ -130,7 +130,6 @@ openstack/openstack-ansible-plugins
 openstack/openstack-ansible-rabbitmq_server
 openstack/openstack-ansible-repo_server
 openstack/openstack-ansible-specs
-openstack/openstack-ansible-tests
 openstack/openstack-doc-tools
 openstack/openstackclient
 openstack/openstackdocstheme