[Merge] lp:~ken-vandine/content-hub/lp1324969 into lp:content-hub

[Michael Sheldon]

Review: Needs Fixing

I'm testing by bumping the version of hub-importer and reinstalling multiple times. It seems to work correctly if content-hub-service isn't running when it's installed, however if content-hub-service is running the click is installed the importer old version gets removed from gsettings but the new version isn't added.
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https://code.launchpad.net/~ken-vandine/content-hub/lp1324969/+merge/221776
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