[Test] Remove persistence files before starting the tests
[Test] Remove persistence files before starting the tests

Change-Id: Id01e5f25444d9bae22b6ffa121193ab2672caf1e

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