MB-100: update test case due to hello command

Change-Id: Ia1eedd6ed8c2a861bb30c74c2ef06cde82f29d4a
Reviewed-on: http://review.couchbase.org/36766
Reviewed-by: Steve Yen <steve.yen@gmail.com>
Tested-by: Bin Cui <bin.cui@gmail.com>