config.cpp => ndb_config.cpp, solves link problems on case insensitive OS
ndb_config.cpp:
  Rename: ndb/tools/config.cpp -> ndb/tools/ndb_config.cpp


ndb/tools/ndb_config.cpp:
  Rename: ndb/tools/config.cpp -> ndb/tools/ndb_config.cpp
ndb/tools/Makefile.am:
  config.cpp => ndb_config.cpp, solves link problems on case insensitive OS