NDB_$ID*.
 - Remove 'logger.log' as default filename from FileLogHandler
 - Require filename argument to Logger::createFileHandler() and always
   call FileLogHandler constructor with that name.
 - Move the addHandler function from Logger to MgmtSrvr thus making it
   significantly easier to pass the default cluster log filename for the
   current node to the FileLogHandler constructor.
 - Make ndb_error_reporter parse out filename=xxx from LogDestination
   and try to copy that file(can theoretically be more than one)
   as well from the remote host.
 - Add testcase making sure that ndb_mgmd does not create logger.log anymore
   but instead defaults to ndb_<nodeid>_cluster.log if LogDestination=FILE:
   has been used wiuthout filename= parameter