[tor-bugs] #17127 [Tor]: Fix and re-enable --master-key option and possibly --out (for keys)

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#17127: Fix and re-enable --master-key option and possibly --out (for keys)
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 Reporter:  nickm        |          Owner:
     Type:  enhancement  |         Status:  new
 Priority:  Medium       |      Milestone:  Tor: 0.2.8.x-final
Component:  Tor          |        Version:
 Severity:  Normal       |     Resolution:
 Keywords:  028-triaged  |  Actual Points:
Parent ID:               |         Points:  small/medium
  Sponsor:  SponsorU     |
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Comment (by s7r):

 We have been asked on the mail list for an option to create ed25519 master
 id keys on demand with `--keygen` in a non-interactive way for management
 scripts or applications which interact with Tor. Currently, when calling
 `--keygen` we are asked for a passphrase (it's not mandatory, we can press
 enter and proceed with an unencrypted master id key but it cannot be done
 in a non-interactive way).

 nusenu suggested and me and teor think it's a good idea to also have a
 `--nopass` option to use with `--keygen`. When used Tor will just create
 an unencrypted master id key without asking for further input.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17127#comment:6>
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