[C++] Report arbitration shutdown to the user.
[C++] Report arbitration shutdown to the user.

Change-Id: I3a7ab9847cbd4861f1b7833a6aca313c42850038

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