Forgot to add unit tests dir as well

Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
Merge pull request #3 from kri5/wip-datasync

Fix option parsing for destination arg

Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Rename variable to match option parsing variable name

The data_log_window variable was renamed rgw_data_log_window
in the option parser, but not elsewhere.

This patch fixes it.

Signed-off-by: Christophe Courtaut <christophe.courtaut@gmail.com>