[tor-bugs] #15942 [Core Tor/Tor]: Make tor connection failures random-exponential-backoff

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#15942: Make tor connection failures random-exponential-backoff
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 Reporter:  teor                                 |          Owner:  andrea
     Type:  defect                               |         Status:
 Priority:  High                                 |  assigned
Component:  Core Tor/Tor                         |      Milestone:  Tor:
 Severity:  Normal                               |  0.2.9.x-final
 Keywords:  SponsorS, 028-triage, tor-dos,       |        Version:
  TorCoreTeam201606                              |     Resolution:
Parent ID:  #17293                               |  Actual Points:
 Reviewer:                                       |         Points:  3
                                                 |        Sponsor:
                                                 |  SponsorU-can
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Comment (by andrea):

 Seems we're using the download_status_t mechanism for all four types of
 dirserver downloads:

   - download_status_t initializers in networkstatus.c control consensus
 downloads
   - initialized in download_status_cert_init() of routerlist.c for cert
 downloads
   - fetch_status in bridge_info_t of entrynodes.c for bridge descriptors,
 set up in
     bridge_add_from_config()
   - for routerdescs, there's a download_status_t in routerstatus_t, and
 these are
     ultimately created by routerstatus_parse_entry_from_string()

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15942#comment:15>
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