aaa: populate display group earlier at login

we have a mess between groups that we display and group that we actually
use (uuid), populate display group earlier in login.

Topic: AAA
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1120720
Change-Id: I01da660c44899eabc85da5c23540ca6a9e8ec433
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>