aaa: Cleaning AuthzUtils from non aaa code

This patch removes from AuthzUtils methods with
DirectoryXXX and DbXXX methods.

This methods were moved to DirectoryUtils.
Bll should work with DirectoryUtils, until it is decided whether to drop it or not.

Change-Id: Idfa1864df2cd2353504be4f10b3b6431a6fdea76
Topic: AAA
Signed-off-by: Yair Zaslavsky <yzaslavs@redhat.com>