[tor-bugs] #16769 [Tor]: add two new functions when manually calling --keygen for better management

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#16769: add two new functions when manually calling --keygen for better management
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     Reporter:  s7r      |      Owner:  nickm
         Type:  defect   |     Status:  needs_review
     Priority:  normal   |  Milestone:  Tor: 0.2.7.x-final
    Component:  Tor      |    Version:  Tor: 0.2.7.2-alpha
   Resolution:           |   Keywords:  ed25519, relay, keys,
Actual Points:           |  TorCoreTeam201509, PostFreeze027
       Points:           |  Parent ID:  #16645
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Comment (by nickm):

 opened #17127 to cover the part of this that I'm not enabling yet.
 Merging what there is with a fixed changes file.  Thanks!

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16769#comment:16>
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