[tor-bugs] #22143 [Core Tor/Tor]: Implement May 3 updates to diff format in prop140

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#22143: Implement May 3 updates to diff format in prop140
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     Reporter:  nickm          |      Owner:
         Type:  defect         |     Status:  new
     Priority:  Medium         |  Milestone:  Tor: 0.3.1.x-final
    Component:  Core Tor/Tor   |    Version:
     Severity:  Normal         |   Keywords:  TorCoreTeam201705
Actual Points:                 |  Parent ID:  #13339
       Points:  1              |   Reviewer:
      Sponsor:  Sponsor4-must  |
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 There are 4 changes to make here:
   * The first digest in our diff code must correspond to the digest-as-
 signed of the consensus document.
   * We must accept <n>,$d as an ed command.
   * We must have the first command in all our generated diffs be a command
 that deletes the signatures.
   * We must change our consdiffmgr index code to index diffs by the
 digest-as-signed of the original document.

 Thanks to Taylor Yu and Alexander Færøy for helping me figure out the
 right solution here.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22143>
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