extapi: aaa: support group resolution control for fetch principal

Topic: AAA
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1120720
Change-Id: I1e7faed5d0b0fa07e5517925bea5fa62d2369145
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>