aaa: make AuthenticationProfileRepository observable

cleanup negotiation filter to update dynamically, as it is not enough to
do lazy, per early requests.

modify observer usage to use local inline object instead of effecting
entire class.

Topic: AAA
Change-Id: I04db3fcb60a2199d5a4af042b589a30023e29ff5
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>