[docs] Add docs for extra configuration properties
[docs] Add docs for extra configuration properties

Change-Id: I7fe61efeafa9bd9d4cf62a378b6c4c7039bbcf6b
Reviewed-on: http://gerrit.cloudera.org:8080/13704
Reviewed-by: Andrew Wong <b68e4fdc6430321a6b47400732ff97d7ae91234e@cloudera.com>
Tested-by: Kudu Jenkins

helifu/kudu,helifu/kudu,helifu/kudu,helifu/kudu,helifu/kudu,helifu/kudu,helifu/kudu,helifu/kudu,helifu/kudu