We're still going through our CentOS 7 kickstart/build process here at Weebly, and we're uncovering new twists every day. There are the obvious ones like systemd, random packages renamed, and things like that. Luckily, the process for enabling LDAP UNIX users and groups (and authentication) is the same process in CentOS 7 as it is CentOS 6. Looks like they're sticking with sssd. It had a few issues once included in CentOS 6, but it seems stable and reliable. That's about the most you can ask for in an authentication provider.
Here's a link to my post about enabling LDAP auth in CentOS 6. It should work in CentOS 7 -- at least it did for us.
A Creole coonass just trying to get by. I live in San Francisco and work as a digital plumber for the joint that runs this thing. (Square/Weebly) Thoughts are mine, not my company's.