Code review comment for lp:~andreserl/maas/lp1573046

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FAIL: maasserver.api.tests.test_pxeconfig.TestPXEConfigAPI.test_pxeconfig_returns_commissioning_os_series_for_other_oses
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_StringException: Traceback (most recent call last):
  File "/tmp/tarmac/branch.9kmefJ/src/maastesting/runtest.py", line 68, in _run_user
    result = function(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/testtools/testcase.py", line 616, in _run_test_method
    return self._get_test_method()()
  File "/tmp/tarmac/branch.9kmefJ/src/maasserver/api/tests/test_pxeconfig.py", line 641, in test_pxeconfig_returns_commissioning_os_series_for_other_oses
    self.assertEqual(release, params_out["release"])
  File "/usr/lib/python2.7/dist-packages/testtools/testcase.py", line 321, in assertEqual
    self.assertThat(observed, matcher, message)
  File "/usr/lib/python2.7/dist-packages/testtools/testcase.py", line 406, in assertThat
    raise mismatch_error
MismatchError: 'xenial' != u'trusty'