[tor-bugs] #30947 [Core Tor/Fallback Scripts]: Add a source line to the header, because type must always be fallback

[Tor Bug Tracker & Wiki]

#30947: Add a source line to the header, because type must always be fallback
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     Reporter:  teor                       |      Owner:  teor
         Type:  defect                     |     Status:  assigned
     Priority:  High                       |  Milestone:  Tor:
                                           |  0.4.1.x-final
    Component:  Core Tor/Fallback Scripts  |    Version:
     Severity:  Normal                     |   Keywords:  fallback,
                                           |  041-should
Actual Points:  0.1                        |  Parent ID:  #28793
       Points:  0.1                        |   Reviewer:
      Sponsor:                             |
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 The dir list spec says that fallback files start with:
 `/* type=fallback */`
 https://gitweb.torproject.org/torspec.git/tree/dir-list-spec.txt#n140

 But in #24953, we change type to whitelist by default. This might cause
 some parsers to break.

 Instead, we should add a new `/* source=whitelist|fallback*/` line.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30947>
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