[tools] KUDU-2671 Update the kudu table describe tool

This patch updates the kudu table describe tool to output ranges
which have a custom hash schema with the corresponding hash schema.
If a partition has multiple custom hash dimensions they are
separated by a space.

Change-Id: I9fa2eb965051a5f63d1c482e6fd43ff654ec6364
Reviewed-on: http://gerrit.cloudera.org:8080/18794
Tested-by: Kudu Jenkins
Reviewed-by: Alexey Serbin <alexey@apache.org>
2 files changed