aaa: cleanup kerberos jaas context names

as jaas context names are static within application and external modules
that requires kerberos should use these, we rename the name to oVirt
prefix, add a new profile for debugging and sync manage domains.

hopefully these are all the options anyone will require.

Topic: AAA
Change-Id: Ia63aafe6e6960568f6002c2dd89157b8a664275e
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>