[tor-bugs] #18337 [Tor]: Remove network dependencies from 0.2.8 unit tests

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#18337: Remove network dependencies from 0.2.8 unit tests
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     Reporter:  teor    |      Owner:  teor
         Type:  defect  |     Status:  new
     Priority:  Medium  |  Milestone:  Tor: 0.2.8.x-final
    Component:  Tor     |    Version:
     Severity:  Normal  |   Keywords:  TorCoreTeam201602
Actual Points:          |  Parent ID:
       Points:          |    Sponsor:
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 Some of the new unit tests in 0.2.8 (#17076) seem to be using the resolver
 on non-existent addresses. This causes them to be slow when the network is
 up, but fast when it's down (at least on my OS X box).

 mikeperry has also complained that they're slow on #17076.

 We could mock the address resolution functions to always return NXDOMAIN
 during these tests to make them faster.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18337>
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