toy-sarath.xml: Update couchdb repo branch

Change-Id: I82b8fc096561bd4ebd9fb26ececf1810c35b0ccc
Reviewed-on: http://review.couchbase.org/39016
Reviewed-by: Sarath Lakshman <sarath@couchbase.com>
Tested-by: Sarath Lakshman <sarath@couchbase.com>