mysql-test/mysql-test-run.sh:
  Change to diskless
mysql-test/ndb/ndb_config_2_node.ini:
  Change to diskless
mysql-test/ndb/ndbcluster.sh:
  Change to diskless
ndb/src/common/mgmcommon/ConfigInfo.cpp:
  Making Discless deprecated, so it still can be used but a warning will be printed if used.
  Adde possibilty to transform a value of type ConfigInfo::BOOL, neede for depicated Discless