Fixed the cluster logfile rotation code, let the cluster log file be renamed correctly when the main log file exceeds the configured maximum size.


ndb/include/util/File.hpp:
  Fix for bug #21345: Error in cluster logfile rotation.
ndb/src/common/logger/FileLogHandler.cpp:
  Fix for bug #21345: Error in cluster logfile rotation.
ndb/src/common/util/File.cpp:
  Fix for bug #21345: Error in cluster logfile rotation.