cbd-1049: perf testing toy builder corrections

Change-Id: Iecbd4542f6c62b7ce7ae58a67ea659136e5a5a4d
Reviewed-on: http://review.couchbase.org/28772
Reviewed-by: Sundararaman Sridharan <sundar.sridharan@gmail.com>
Tested-by: Sundararaman Sridharan <sundar.sridharan@gmail.com>