[tor-bugs] #30153 [Core Tor/Chutney]: Add a command to chutney and test-network.sh that prints the default option values

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#30153: Add a command to chutney and test-network.sh that prints the default option
values
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     Reporter:  teor              |      Owner:  (none)
         Type:  enhancement       |     Status:  new
     Priority:  Medium            |  Milestone:
    Component:  Core Tor/Chutney  |    Version:
     Severity:  Normal            |   Keywords:  refactor, easy
Actual Points:                    |  Parent ID:
       Points:  1                 |   Reviewer:
      Sponsor:  Sponsor19-can     |
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 Follow up to #30059.

 We should make a chutney command and a test-network.sh command that prints
 their default option values.

 Maybe we could even import the defaults from chutney into test-network.sh.

 Then we can update the README to say:
 "For the default values of these options, run..."

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30153>
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