[tor-bugs] #21261 [Obfuscation/Pluggable transport]: goptlib should enforce the `TOR_PT_SERVER_BINDADDR` restriction.

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#21261: goptlib should enforce the `TOR_PT_SERVER_BINDADDR` restriction.
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     Reporter:  yawning                          |      Owner:  asn
         Type:  defect                           |     Status:  new
     Priority:  Medium                           |  Milestone:
    Component:  Obfuscation/Pluggable transport  |    Version:
     Severity:  Normal                           |   Keywords:  goptlib
Actual Points:                                   |  Parent ID:
       Points:                                   |   Reviewer:
      Sponsor:                                   |
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 Followup from #21136.

 `TOR_PT_SERVER_BINDADDR` by spec is limited to one address+port per
 transport.  goptlib should enforce this, and raise an `ENV-ERROR` if
 anyone tries to specify more than one.

 I could add code in obfs4proxy to check for this, but it's a spec
 restriction, so goptlib doing the enforcement seems more appropriate.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21261>
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