aaa: Optimizing fetchPrincipalIdsRecursively

The following optimization is introruced:
a. Not using recursive groups resolving - performing manual recursion instead
b. During the manual recrusion - don't fetch groups that were already fetched

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1120720
Change-Id: I095bb91810e25d345fcd053cbd51d1d25a4b494d
Signed-off-by: Yair Zaslavsky <yzaslavs@redhat.com>