[Tails-dev] Made New Identity work again, please review

>>>> +TOR_CONTROL_PASSWD='passwd'
>>>
>>> Why do we set this?
>>
>> Iceweasel (as "amnesia") does not have access to the authentication
>> cookie, and shouldn't. If Torbutton cannot read the authentication cookie,
>> it refuses to talk to the control port, even when substituted with this
>> filter. So I need to tell it what the cookie is using TOR_CONTROL_PASSWD,
>> and it will now talk to the filter trying to authenticate with this value
>> instead. The filter accepts all authentication regardless of value, as
>> noted in the code.
>
> Ah, I see. Could you please add a code comment at the place where
> `TOR_CONTROL_PASSWD` is set, explaining this non-obvious (at least to me
> :)) assignment?

Done, same branch (winterfairy:bugfix/torbutton-new-identity).