[tor-bugs] #29702 [Core Tor/Tor]: Stop using configs from the local tor install when we launch tor for tests

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#29702: Stop using configs from the local tor install when we launch tor for tests
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     Reporter:  teor          |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: unspecified
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  technical-debt, tor-test
Actual Points:                |  Parent ID:
       Points:  1             |   Reviewer:
      Sponsor:                |
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 We should stop using paths in /usr when we're launching tor for build
 tests.

 We don't get full logs for all the tor processes we launch, but these
 scripts launch tor, so they're probably affected:
 * test_rebind.sh
 * test_key_expiration.sh
 * test_keygen.sh
 * test_zero_length_keys.sh

 test-network.sh is also affected, but we'll deal with that in chutney in
 #29701.

 For example, on my machine, test_rebind.sh does:
 {{{
 2019-03-05 11:00:11.573 Tor logged: "Mar 05 11:00:11.571 [notice]
 Configuration file "/usr/local/etc/tor/torrc" not present, using
 reasonable defaults.", waiting for "Opened Control listener on"
 2019-03-05 11:00:11.596 Tor logged: "Mar 05 11:00:11.591 [notice] Parsing
 GEOIP IPv4 file /usr/local/share/tor/geoip.", waiting for "Opened Socks
 listener"
 2019-03-05 11:00:11.899 Tor logged: "Mar 05 11:00:11.899 [notice] Parsing
 GEOIP IPv6 file /usr/local/share/tor/geoip6.", waiting for "Opened Socks
 listener"
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29702>
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