[C++] Added missing evaluate call for DefaultArbitrator
[C++] Added missing evaluate call for DefaultArbitrator

Without this call, the results of the lookup apparently
won't be used

Change-Id: Iae9c46bbd088a93252eaa2f2c2d7f19cacc29f9c

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