[C++] add unit test for JoynrMessageFactory.createMulticastPublication
[C++] add unit test for JoynrMessageFactory.createMulticastPublication

Change-Id: I05eb40aec850a4e5dcc977eaa42dd96e0b7b634c

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