KUDU-3326 [master] add improvement on interpreting the 'reserve_seconds' field for DeleteRPC

If the field 'reserve_seconds' is specified by the client, then it's clear the delete request
coming from a newer Kudu client with the precise value for 'reserve_seconds', and the
field's value from the request should be taken as-is regardless of the current setting of the
--deleted_table_reserve_seconds flag at the server side.

Change-Id: I604caf5d7326e27acd6d626b482376fc6eed1b0f
Reviewed-on: http://gerrit.cloudera.org:8080/19047
Tested-by: Kudu Jenkins
Reviewed-by: Yingchun Lai <acelyc1112009@gmail.com>
13 files changed