[tor-bugs] #29703 [Core Tor/Tor]: Backport test-network.sh fixes to 0.2.9

[Tor Bug Tracker & Wiki]

#29703: Backport test-network.sh fixes to 0.2.9
-------------------------+-------------------------------------------------
     Reporter:  teor     |      Owner:  (none)
         Type:  defect   |     Status:  new
     Priority:  Medium   |  Milestone:  Tor: 0.4.1.x-final
    Component:  Core     |    Version:  Tor: 0.2.9.1-alpha
  Tor/Tor                |   Keywords:  CI, PTs 029-backport network-team-
     Severity:  Normal   |  roadmap-2019-Q1Q2
Actual Points:           |  Parent ID:  #29280
       Points:  0.5      |   Reviewer:
      Sponsor:           |
-------------------------+-------------------------------------------------
 In our 0.3.4 chutney CI, we get the chutney version of test-network.sh:
 {{{
 test-network.sh: using CHUTNEY_DNS_CONF '/dev/null'
 test-network.sh: $TOR_DIR not set, trying $PWD
 test-network.sh: $TOR_DIR is a Tor 0.3.4 or earlier build directory
 }}}
 https://travis-ci.org/torproject/tor/jobs/499382754#L3067

 But in 0.2.9, we get the tor version of test-network.sh:
 {{{
 test-network.sh: Parsing command-line arguments to find $CHUTNEY_PATH
 test-network.sh: $TOR_DIR not set, trying $PWD

 Launching chutney using Python 2.7.6
 }}}
 https://travis-ci.org/torproject/tor/jobs/499382330#L2859

 But tor 0.2.9's test-network.sh is meant to call chutney's test-
 network.sh.

 We should fix this bug to make sure that we're getting consistent results
 from our CI. There are a lot of extra bug fixes in the latest chutney's
 test-network.sh, that aren't in tor 0.2.9's test-network.sh.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29703>
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