CBQE-2200 fix couchbase-cli help short form

Change-Id: Idb0226d7b52f6b176bc1c383ba81c4b74ab0f7b9
Reviewed-on: http://review.couchbase.org/35890
Tested-by: Thuan Nguyen <soccon@gmail.com>
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Tommie McAfee <tommie@couchbase.com>