bridge and bridge authority proposal

[Peter Palfrader]

> On more thought, I think we should fix this by adding a new config option
> that all bridges should set: "BridgeRelay 1"
> 
> When this is set, Tor automatically acts like a dir cache, whether or
> not DirPort is set, and it automatically answers BEGIN_DIR questions
> whether or not DirPort is set.

Be careful about how we fetch the directory tho.  Else watching who
fetches server descriptors at the authorities becomes a good way to find
bridges.

Peter
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