Change acl_config to acl-config like the docs say.

Change-Id: I8d81fae808d52ab347304949b9eb580cc5557fdb
Reviewed-on: https://review.openstack.org/23824
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Approved: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins