ipv6connect test needs to be fixed

[Po-Hsu Lin]

ipv6connect test with the recent setup change (86af9ccad991) will fail on the first run.
It's ok with commit e8357cdd7aff.

Also if you try to run it twice, it will pass the test.

FAIL ipv6connect ipv6connect timestamp=1531279747 localtime=Jul 11 03:29:07 Unhandled AttributeError: 'str' object has no attribute 'append'
  Traceback (most recent call last):
    File "/home/ubuntu/autotest/client/shared/test.py", line 823, in _call_test_function
      return func(*args, **dargs)
    File "/home/ubuntu/autotest/client/shared/test.py", line 291, in execute
      postprocess_profiled_run, args, dargs)
    File "/home/ubuntu/autotest/client/shared/test.py", line 212, in _call_run_once
      self.run_once(*args, **dargs)
    File "/home/ubuntu/autotest/client/tests/ipv6connect/ipv6connect.py", line 46, in run_once
      self.results.append(result.stderr)
  AttributeError: 'str' object has no attribute 'append'

[Po-Hsu Lin (cypressyew)]

http://kernel.ubuntu.com/git/ubuntu/autotest-client-tests.git/commit/?id=481edaa9bb6a0e2964e99cd824b9aa26cb8055f7