Comment 8 for bug 1534510

On all controllers in /etc/heat/heat.conf:
[cache]
enabled=True
backend=oslo_cache.memcache_pool
memcache_servers=10.109.1.6:11211

Verified on:
[root@nailgun /]# shotgun2 short-report
cat /etc/fuel_build_id:
 467
cat /etc/fuel_build_number:
 467
cat /etc/fuel_release:
 9.0
cat /etc/fuel_openstack_version:
 mitaka-9.0