[Merge] lp:~ken-vandine/content-hub/ual_cpp_multi_instance into lp:content-hub

[Ken VanDine]

The proposal to merge lp:~ken-vandine/content-hub/ual_cpp_multi_instance into lp:content-hub has been updated.

Commit Message changed to:

* Ported to UAL's C++ API
* Keep references to HelperInstance, SourceInstance and DestinationInstance on the Transfer

For more details, see:
https://code.launchpad.net/~ken-vandine/content-hub/ual_cpp_multi_instance/+merge/315615
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Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~ken-vandine/content-hub/ual_cpp_multi_instance into lp:content-hub.