AME-6578 CR-6699 Remove ConfigurationBase#isLegacy methods
CR-2975 OPENAM-2527: "Sub schema did not exist" when using ssoadm add-sub-schema
CR-2855 OPENAM-2248/OPENAM-2249: ssoadm.jsp - get-sub-cfg shows incorrect text
CR-2692 OPENAM-2250: ssoadm.jsp - get-sub-cfg throws NullPointerException
Fix for OPENAM-2160, review CR-1268.
Fix for AME-210 - review: CR-829