Bug#832101: Installing pulseaudio-module-udev

[juichenieder-debbie at yahoo.co.uk]

I don't this bug should have been closed just yet.  The original reporter obviously had a
difficult time figuring out where the problem lay, and no doubt countless others will too.

At the very least a message needs to go out in apt-get upgrade telling people that they
should and cite that pauvcontrol will loose functionality if they don't; but ideally the
"error" message in pavucontrol needs changing to something like:

```

No devices were found.
If you expected to see devices here, check that you have pulseaudio-module-udev installed.
```