Add message for threadpool in usage() of testHarness.sh
Add message for threadpool in usage() of testHarness.sh

Fiware/data.Orion,McMutton/fiware-orion,McMutton/fiware-orion,McMutton/fiware-orion,McMutton/fiware-orion,Fiware/data.Orion,Fiware/data.Orion,McMutton/fiware-orion,Fiware/data.Orion,Fiware/data.Orion,Fiware/data.Orion,telefonicaid/fiware-orion,McMutton/fiware-orion,telefonicaid/fiware-orion,telefonicaid/fiware-orion,McMutton/fiware-orion,telefonicaid/fiware-orion,telefonicaid/fiware-orion,telefonicaid/fiware-orion