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

[Michael Sheldon]

Review: Needs Fixing

The peer currently only registers as an exporter for pictures and contacts, so will need music adding to content-hub-test-exporter.json
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https://code.launchpad.net/~ken-vandine/content-hub/test_exporter_music/+merge/277378
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