[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_revision
     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):

 Fixup pushed.  Now --keygen --newpass no longer forces a new signing key,
 though one will be generated if the current signing key is missing or old.
 You don't need to copy it over if you don't want to.

 Next step, figuring out master_key

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16769#comment:8>
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