[metrics-bugs] #29650 [Metrics]: Rewrite exit scanner to produce exit lists according to new format

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#29650: Rewrite exit scanner to produce exit lists according to new format
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     Reporter:  irl      |      Owner:  metrics-team
         Type:  project  |     Status:  new
     Priority:  Medium   |  Milestone:
    Component:  Metrics  |    Version:
     Severity:  Normal   |   Keywords:  metrics-roadmap-2019-q2
Actual Points:           |  Parent ID:
       Points:           |   Reviewer:
      Sponsor:           |
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 The current exit scanner is purpose written software using Haskell. It is
 non-trivial to update this program to run on a modern Debian system and
 would be easier in the longer term to simply replace.

 This task requires the new exit list specification to be completed in
 #29624.

 Expected new features:

 * Written in Python
 * Support for IPv6
 * Support for new exit list format

 Features we would like:

 * Cryptographically signed measurement results
 * Archival signatures

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29650>
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