fixed memory leak in object map
fixed uninitialized value blobs_pending


ndb/include/mgmapi/mgmapi.h:
  added ndb_mgm_destroy_configuration call
ndb/src/mgmapi/mgmapi.cpp:
  added ndb_mgm_destroy_configuration call
ndb/src/ndbapi/ObjectMap.hpp:
  fixed memory leak
ndb/src/ndbapi/ndb_cluster_connection.cpp:
  added ndb_mgm_destroy_configuration call
sql/ha_ndbcluster.cc:
  fixed uninitialized value blobs_pending