Active directory integration (sssd) does not use AD Sites to find near DC/GC

Issue

Using SSSD for Active Directory integration, unless I hardcode dns_discovery_domain with the Site code, SSSD doesn't seem to use sites and services to bind to a GC/Domain Controller in the current site (aka close to the host)

Using this override works:
dns_discovery_domain = Chicago._sites.acme.com

But if I don't use this override - I usually get a DC/GC in Hong Kong or London, when my host is in Chicago. adcli seems to understand the info but sssd doesn't. According to the SSSD project notes, this functionality should be in the RH7 release - but it doesn't appear to work.

[root@ll-chrhel7beta01 ~]# adcli info acme.com
...output trimmed....
[domain]
domain-name = acme.com
domain-short = ACME
domain-forest = adroot.local
domain-controller-site = Chicago
[computer]
computer-site = Chicago