[tor-bugs] #30059 [Core Tor/Chutney]: Update chutney's README

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#30059: Update chutney's README
-------------------------------------------------+-------------------------
 Reporter:  teor                                 |          Owner:  teor
     Type:  defect                               |         Status:
                                                 |  merge_ready
 Priority:  Medium                               |      Milestone:
Component:  Core Tor/Chutney                     |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  doc, chutney-ci, network-team-       |  Actual Points:  0.2
  roadmap-2019-Q1Q2                              |
Parent ID:  #29729                               |         Points:  0.2
 Reviewer:  nickm                                |        Sponsor:
                                                 |  Sponsor19
-------------------------------------------------+-------------------------

Comment (by teor):

 Replying to [comment:2 nickm]:
 > LGTM though I think another branch I just reviewed changes
 CHUTNEY_START_TIME to 120.

 You're right, I'll fix the docs when I merge that branch.

 > Maybe we should stop mentioning default values inline, and instead have
 their documentation be automagically generated somehow.  We seem to change
 them a lot.  (That could be another ticket though.)

 I opened #30153 for this change: I think we need to be able to print the
 defaults using a chutney command. Then we can stop mentioning the defaults
 inline (or autogenerate the docs).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30059#comment:3>
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