[tor-bugs] #30594 [Core Tor/Stem]: stem unit tests fail on Tor 0.2.9, which is still supported until 1 January 2020

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#30594: stem unit tests fail on Tor 0.2.9, which is still supported until 1 January
2020
-------------------------------+------------------------------
     Reporter:  teor           |      Owner:  atagar
         Type:  defect         |     Status:  new
     Priority:  Medium         |  Milestone:
    Component:  Core Tor/Stem  |    Version:
     Severity:  Normal         |   Keywords:  ci, travis, stem
Actual Points:                 |  Parent ID:  #28170
       Points:                 |   Reviewer:
      Sponsor:  Sponsor31-can  |
-------------------------------+------------------------------
 {{{
   client.connection...                                 failed (0.05s)
 test_connection_time                                  25 ms  [SUCCESS]
 test_established                                             [FAILURE]
 test_invalid_arguments                                 1 ms  [SUCCESS]
 test_no_common_link_protocol                           9 ms  [SUCCESS]
 test_not_orport                                        1 ms  [SUCCESS]
 ======================================================================
 FAIL: test_established
 ----------------------------------------------------------------------
 Traceback (most recent call last):
   File "/home/travis/build/teor2345/stem/test/integ/client/connection.py",
 line 66, in test_established
     self.assertEqual(5, int(conn.link_protocol))
 AssertionError: 5 != 4
 ----------------------------------------------------------------------
 Ran 5 tests in 0.042s
 FAILED (failures=1)
 }}}
 https://travis-ci.org/teor2345/stem/jobs/536613171#L1865

 Link protocol 4 is supported by 0.2.9, and 5 is supported by 0.3.1.1-alpha
 and later:
 https://gitweb.torproject.org/torspec.git/tree/tor-spec.txt#n1984

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30594>
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