After [1] iptables rules are not set for memcached service thus services relying on memcached were not functioning well. With [2] it's requrired to use hiera interpolation for service configs, this patch fixes it for memcached_network. [1] https://review.openstack.org/#/c/551292 [2] https://review.openstack.org/#/c/526692 Related-Bug: #1757556 Closes-Bug: #1763009 Change-Id: If9b274192ea4738f455a6106ff1a62eb4e7a5c91