[tor-bugs] #31317 [- Select a component]: Stop reading ~/.torrc during stem's test_hush_argument

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#31317: Stop reading ~/.torrc during stem's test_hush_argument
--------------------------------------+--------------------
     Reporter:  teor                  |      Owner:  (none)
         Type:  defect                |     Status:  new
     Priority:  Medium                |  Milestone:
    Component:  - Select a component  |    Version:
     Severity:  Normal                |   Keywords:
Actual Points:                        |  Parent ID:
       Points:                        |   Reviewer:
      Sponsor:                        |
--------------------------------------+--------------------
 In #30102, we put random data in ~/.torrc, which breaks stem's
 test_hush_argument test.

 {{{
 ======================================================================
 FAIL: test_hush_argument
 ----------------------------------------------------------------------
 Traceback (most recent call last):
   File "/home/travis/build/torproject/tor/stem/stem/util/test_tools.py",
 line 152, in <lambda>
     self.method = lambda test: self.result(test)  # method that can be
 mixed into TestCases
   File "/home/travis/build/torproject/tor/stem/stem/util/test_tools.py",
 line 225, in result
     test.fail(self._result.msg)
 AssertionError: Expected '[warn] Failed to parse/validate config: Unknown
 option 'invalid_argument'.  Failing.' to be within 'Aug 01 20:10:11.551
 [warn] Failed to parse/validate config: Unknown option '����QT��
 ~��V���vLҶ�
 ���\��ޠ@qw�F��0v��$5�EJ��hܱd�FӺTm��Oo'.  Failing.
 Aug 01 20:10:11.562 [err] Reading config failed--see warnings above.
 '
 ----------------------------------------------------------------------
 }}}
 https://travis-ci.org/torproject/tor/jobs/566642646#L4609

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31317>
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