[tor-bugs] #12600 [Tor]: Save retrieved bridge information in our state file

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#12600: Save retrieved bridge information in our state file
------------------------+------------------------------
 Reporter:  asn         |          Owner:
     Type:  task        |         Status:  new
 Priority:  normal      |      Milestone:  Tor: 0.2.???
Component:  Tor         |        Version:
 Keywords:  tor-bridge  |  Actual Points:
Parent ID:              |         Points:
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 Currently, Tor clients don't remember anything about bridges after a
 restart.
 So for example, if there was a torrc Bridge line without a fingerprint
 specified, and Tor retrieves the fingerprint from the descriptor, it won't
 save it on the disk.

 Or, if a bridge changed IP:PORT, but we managed to get its new ip:port
 using the bridge authority (see #12599), we will not save this down
 either.

 Fortunately, Sebastian wrote proposal192 about this issue:
 https://gitweb.torproject.org/torspec.git/blob/HEAD:/proposals/192-store-
 bridge-information.txt

 We should re-read the proposal, revise it as needed and implement it.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/12600>
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