KUDU-1230. Add an admin tool to delete a table

This patch adds 'list_tables' and 'delete_table' to the kudu-admin tool.
Nothing fancy is being done, it's simple enough to use command line
utilities if there's a need to delete tables based on some selection
criteria.

Change-Id: I6d633b54e9cfd8f23c7f5fef6ff504cb04a02f35
Reviewed-on: http://gerrit.cloudera.org:8080/1459
Tested-by: Internal Jenkins
Reviewed-by: Mike Percy <mpercy@cloudera.com>
(cherry picked from commit 61e6cd19f3b350448e6ea649d34a43962fb6f345)
Reviewed-on: http://gerrit.cloudera.org:8080/1496
Reviewed-by: Jean-Daniel Cryans
Tested-by: Jean-Daniel Cryans
2 files changed