Some new code that does this job is being written against 5.1. This code is
largely removed from that work.


ndb/include/kernel/GlobalSignalNumbers.h:
  remove dead (never used) MGM_(UN)LOCK signal numbers
ndb/src/mgmsrv/Config.cpp:
  remove unused generation number code.
  
  remove unused Config::change
ndb/src/mgmsrv/Config.hpp:
  remove unused generation number prototypes.
ndb/src/mgmsrv/MgmtSrvr.cpp:
  remove unused getPrimaryNode
ndb/src/mgmsrv/MgmtSrvr.hpp:
  remove prototypes for config lock and commit/rollback.
ndb/src/mgmsrv/MgmtSrvrConfig.cpp:
  remove CONFIG (UN)LOCK signals, lockConf/unlockConf, commit/rollback and changeConfig.
  
  never used.
ndb/src/mgmsrv/Services.cpp:
  remove unused configuration locking code
ndb/src/mgmsrv/Services.hpp:
  remove usused configuration locking code