[C++] Ensure the libjoynr runtime is loading persisted subscriptions
[C++] Ensure the libjoynr runtime is loading persisted subscriptions

Change-Id: I3d7d6a837b1929d71c579d98754b0b8b61f5e7bd

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