[Test] Make usage of maven configurable in performance test script
[Test] Make usage of maven configurable in performance test script

The joynr runtime container does not use maven to start jetty or other
java applications

Change-Id: I8e054af8dca1ba78e1cf58da9e56f161ff2a140b

bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,clive-jevons/joynr,clive-jevons/joynr,bmwcarit/joynr,clive-jevons/joynr,clive-jevons/joynr,bmwcarit/joynr,bmwcarit/joynr,clive-jevons/joynr,clive-jevons/joynr