CBQE-0 fix usage output

Change-Id: I3f29cd57f216543602511ed56570fac6c906033d
Reviewed-on: http://review.couchbase.org/37448
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>