Mediascanner does not do thumbnailing at all. All of that is done by the
thumbnailer library + service. Those should be confined already, but in
case they are not, here's the skinny:

- there are two kinds of thumbnails: those created from files and those that 
are downloaded (album art)
- for files, thumbnailer uses the global cache for unconfined apps and 
app-local dir for confined apps so it should work for everyone
- to get album art thumbnails you need to be able to access the dbus service 
(which I think is available for all applications as it's read only)
- the dbus service needs to be able to access the net and write to the cache 
dir (which it already can do, otherwise no album art would ever show up)

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https://bugs.launchpad.net/bugs/1303962

Title:
  please integrate mediascanner2 and media-hub with apparmor

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