MB-100 Add missing space.

Change-Id: I1d41790519d2dfdb60882da009479b90db3a0a2e
Reviewed-on: http://review.couchbase.org/30071
Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Reviewed-by: Artem Stemkovski <artem@couchbase.com>