Fix scan_coordinator tests to adapt with queryport API changes

Change-Id: I37dcef8d246d53282e5fff3140f14e95d7571788
Reviewed-on: http://review.couchbase.org/44001
Reviewed-by: Deepkaran Salooja <deepkaran.couchbase@gmail.com>
Reviewed-by: Sarath Lakshman <sarath@couchbase.com>
Tested-by: Sarath Lakshman <sarath@couchbase.com>