[tor-bugs] #19072 [Core Tor/Tor]: Remove duplicate signing_cert field from extrainfo and routerinfo.

[Tor Bug Tracker & Wiki]

#19072: Remove duplicate signing_cert field from extrainfo and routerinfo.
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     Reporter:  nickm         |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.2.8.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:  0.1           |   Reviewer:
      Sponsor:                |
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 Related to my fix for #17150.  This makes sense to do in 0.2.8 and forward
 only.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19072>
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