Make root temp directory path configurable in HiveAbstractDatasetRepository

When importing data into Hive Kite creates a temporary directory in /tmp and if the import is successful it moves the data into the Hive warehouse.
However on a secure cluster if a /tmp and the Hive warehouse directories are in separate encryption zones this move fails because the 2 directories are encrypted with different keys and the move operation is not supported.
This change introduces a configuration key which enables the users to set the path of the temporary directory.