CBQE-2201 fix couchbase-cli short help test

Change-Id: Ia64532bbc3e66112269cb9a7907b0e538bac2e12
Reviewed-on: http://review.couchbase.org/35909
Tested-by: Thuan Nguyen <soccon@gmail.com>
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Parag Agarwal <agarwal.parag@gmail.com>