[tor-bugs] #17902 [Tor]: Backport get_if_addrs unit test fixes to 0.2.7

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#17902: Backport get_if_addrs unit test fixes to 0.2.7
------------------------+--------------------------------
     Reporter:  teor    |      Owner:
         Type:  defect  |     Status:  new
     Priority:  Medium  |  Milestone:  Tor: 0.2.7.x-final
    Component:  Tor     |    Version:
     Severity:  Normal  |   Keywords:  027-backport
Actual Points:          |  Parent ID:
       Points:          |    Sponsor:
------------------------+--------------------------------
 The unit tests are failing on one of our jenkins FreeBSD instances with:
 {{{
 https://jenkins.torproject.org/job/tor-ci-freebsd-amd64-0.2.7/19/console
 41:24 address/get_if_addrs_ifaddrs: [forking]
 20:41:24   FAIL ../tor/src/test/test_address.c:272:
 assert(smartlist_contains_localhost_tor_addr(results))
 20:41:24   [get_if_addrs_ifaddrs FAILED]
 }}}

 There are fixes for these errors in master.

 I need to locate the commit that fixes these, and backport it. (Hopefully,
 it's a simple cherry-pick.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17902>
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