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GHI29: peer: Clean up timers if the station disappears

`weakref.ref()` can take a callback that notifies us that the referenced
object is about to disappear.  While we could add guards to all the
functions that will barf without a station, the issue correctly points
out this is all triggered by a timer firing.

If the station goes, we do not need the timer anymore.  So when the
station goes, immediately stop all timers so nothing fires.

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