some other small fixes


ndb/include/mgmcommon/ConfigRetriever.hpp:
  added options to do_connect to contol how connects failures should be treated
ndb/include/mgmcommon/NdbConfig.h:
  method to retrieve datadir path (to user for chdir)
ndb/include/ndbapi/ndb_cluster_connection.hpp:
  Added connect thread
ndb/src/common/mgmcommon/ConfigRetriever.cpp:
  added options to do_connect to contol how connects failures should be treated
ndb/src/common/mgmcommon/NdbConfig.c:
  method to retrieve datadir path (to user for chdir)
ndb/src/kernel/main.cpp:
  ndbd to do chdir
ndb/src/kernel/vm/WatchDog.cpp:
  added my_thread_init for debug
ndb/src/ndbapi/ClusterMgr.cpp:
  added my_thread_init for debug
ndb/src/ndbapi/TransporterFacade.cpp:
  removed call to atexit
ndb/src/ndbapi/ndb_cluster_connection.cpp:
  added connect thread