[Merge] lp:~timo-jyrinki/qtubuntu-media/port_to_new_audio_role_api into lp:qtubuntu-media

[Jim Hodapp]

Review: Approve code

Looks good. One reminder. Before this will function correctly we need to update at least media-hub but I'm also thinking we need to update pulseaudio as it is the layer that gives meaning to these various roles and this new list is completely different.
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https://code.launchpad.net/~timo-jyrinki/qtubuntu-media/port_to_new_audio_role_api/+merge/273392
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