[tools] update on 'kudu table create' command

This patch updates the code related to the kudu CLI command
'table create':
  * added 'owner' field to CreateTablePB/JSON
  * added 'comment' field to CreateTablePB/JSON
  * updated corresponding comments in the tool.proto file
  * fixed the example of the JSON object for CreateTablePB
  * made the example of JSON object for CreateTablePB redable
  * re-ordered string constants in tool_action_table.cc
  * other minor updates

Change-Id: Ib2855ee07e0dae4df669e6dd1d5ad4281d3b906b
Reviewed-on: http://gerrit.cloudera.org:8080/18796
Tested-by: Kudu Jenkins
Reviewed-by: Abhishek Chennaka <achennaka@cloudera.com>
Reviewed-by: Attila Bukor <abukor@apache.org>
2 files changed