Toybuilder: couchstore

Change-Id: I2239e07bfd87400bfae1b3b59fb818a3798e9945
Reviewed-on: http://review.couchbase.org/38837
Reviewed-by: abhinav dangeti <abhinav@couchbase.com>
Tested-by: abhinav dangeti <abhinav@couchbase.com>