core: Replace oVirt logger with slf4j in aaa

Replaces oVirt logger with slf4j in aaa module.

Change-Id: Ic51dce32ddfd2453dbb0d143b8ca83ae76663b8b
Bug-Url: https://bugzilla.redhat.com/1109871
Signed-off-by: Martin Perina <mperina@redhat.com>