[tools] KUDU-1945: Kudu table copy and perf loadgen

This patch introduces support for 'table copy' CLI tool for the tables
with auto-incrementing columns. While scanning the source table, we do
not scan the auto incrementing column and while writing back the
rows to the destination table, we write all the scanned rows. The
auto-incrementing column is then populated at the server side during
each row's write.

It also adds support for 'perf loadgen' CLI tool to insert into tables
with auto incrementing columns. This currently only works with insert
and insert_ignore write operation. upsert and upsert_ignore are not
supported currently.

Change-Id: I754a7e84c16d1f3b2d52be937e1eb50b3d00d759
Reviewed-on: http://gerrit.cloudera.org:8080/19890
Reviewed-by: Alexey Serbin <alexey@apache.org>
Tested-by: Kudu Jenkins
4 files changed