test_fetch sporadic failure

[FAIL]
Traceback (most recent call last):
  File "/var/jenkins/workspace/landscape-hosted-staging-merge/source/landscape-client/staging/landscape/lib/tests/test_fetch.py", line 449, in check_messages
    "Couldn't fetch file from http://im/wrong "
  File "/usr/lib/python2.7/dist-packages/twisted/trial/_synctest.py", line 356, in assertEqual
    % (msg, pformat(first), pformat(second)))
twisted.trial.unittest.FailTest: not equal:
a = "Couldn't fetch file from http://im/right (setopt() can't be called after perform())"
b = "Couldn't fetch file from http://im/wrong (Server returned HTTP code 404)"

landscape.lib.tests.test_fetch.FetchTest.test_fetch_to_files_with_errors

Example failing job:

https://ci.lscape.net/job/landscape-hosted-staging-merge/517/console