CBQE- Add support for larger_is_better false
CBQE- Add support for larger_is_better false

Change-Id: Ifc19f94525ec228e86fb2e2347623f3c0299d367
Reviewed-on: http://review.couchbase.org/63437
Reviewed-by: Ketaki Gangal <a5dce29d82b35a7c3450ec2c8589d08111573475@couchbase.com>
Tested-by: Ketaki Gangal <a5dce29d82b35a7c3450ec2c8589d08111573475@couchbase.com>

couchbase/perfrunner,EricACooper/perfrunner,couchbase/perfrunner,EricACooper/perfrunner,couchbase/perfrunner,pavel-paulau/perfrunner,pavel-paulau/perfrunner,pavel-paulau/perfrunner,pavel-paulau/perfrunner,EricACooper/perfrunner,couchbase/perfrunner,couchbase/perfrunner,pavel-paulau/perfrunner,couchbase/perfrunner,EricACooper/perfrunner