Improvements suggested by UCDetector: remove dead code, add final keywords,...

Jean-Noël Rouvignac

22.56.2016 83f86f11c27378d650c3bfc7e55397687062edbc

opendj-server-legacy/src/main/java/org/opends/server/util/ModifyOnceNewConfigFrameworkIsUsed.java does not exist in tree 866b53f8d5848a676b36c53864d2c037311cbb77