aaa: sort domain names a-b ascending.

Change-Id: Ia3d0a64c872f8d2a018be08587303b5358c3a18c
Topic: AAA
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1115549
Signed-off-by: Mooli Tayer <mtayer@redhat.com>