[tor-bugs] #33699 [Community/Relays]: Create an exitmap module for DNS exit checks

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#33699: Create an exitmap module for DNS exit checks
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     Reporter:  gk         |      Owner:  gk
         Type:  project    |     Status:  assigned
     Priority:  Medium     |  Milestone:
    Component:             |    Version:
  Community/Relays         |
     Severity:  Normal     |   Keywords:  network-health, GeorgKoppen202003
Actual Points:             |  Parent ID:  #33695
       Points:  1          |   Reviewer:
      Sponsor:             |
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 I think `exitmap` has a lot of infrastructure which could get used for DNS
 exit checks. And we already run `exitmap` with different modules for a
 bunch of our bad relay checks. So, I propose to create dns check module
 and we could use the already existing `dnssec.py` one for running another,
 related, check to get an overview of all the DNS related problems our
 exits have.

 We should try to keep the output format similar to Arthur's to make it
 easier to parse both results series.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33699>
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