CustomService objects in policy and nat rules for asa 8.3 using
named objects and object-groups.
-- see #1942 "ASA NAT - if custom service is included in service
group incorrect config generated"
-- see #1929 "move map named_objects inside class NamedObjectManager"
-- see #1946 "restrict generation of the named objects by
PolicyCompiler_pix to ASA 8"
-- see #1885 "named network and service objects in pix8"