[Build] Fix maven clean in cpp/tests
[Build] Fix maven clean in cpp/tests

Change-Id: I1e557eb0d9698f77a139716fed4d84d1fff4d6fe

bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr