rename config.cpp -> ndb_config.cpp for case insesitive filesystems
why wasn't this done in 4.1 directly


ndb/tools/ndb_config.cpp:
  Rename: ndb/tools/config.cpp -> ndb/tools/ndb_config.cpp
mysql-test/t/ndb_config.test:
  remove include only present in 5.0
ndb/tools/Makefile.am:
  rename config.cpp -> ndb_config.cpp for case insesitive filesystems
  why wasn't this done in 4.1 directly