tests: fix failure due to pytest deprecation

[little-dude]

tests are failing due to a fixture being deprecated in pytest. For instance: https://travis-ci.org/docker/docker-py/jobs/458206472

_________________ FindConfigFileTest.test_find_config_fallback _________________
tests/unit/utils_config_test.py:24: in test_find_config_fallback
    tmpdir = self.tmpdir('test_find_config_fallback')
tests/unit/utils_config_test.py:19: in tmpdir
    tmpdir = ensuretemp(name)
.tox/py27/lib/python2.7/site-packages/_pytest/tmpdir.py:96: in ensuretemp
    warnings.warn(PYTEST_ENSURETEMP, stacklevel=2)
E   RemovedInPytest4Warning: pytest/tmpdir_factory.ensuretemp is deprecated, 
E   please use the tmp_path fixture or tmp_path_factory.mktemp

[GordonTheTurtle]

Please sign your commits following these rules:
https://github.com/moby/moby/blob/master/CONTRIBUTING.md#sign-your-work
The easiest way to do this is to amend the last commit:

$ git clone -b "fix_deprecation" git@github.com:little-dude/docker-py.git somewhere
$ cd somewhere
$ git commit --amend -s --no-edit
$ git push -f

Amending updates the existing PR. You DO NOT need to open a new one.

[little-dude]

Not sure why Jenkins is failing. Is it because of those INTERNALERROR?

[little-dude]

Ah yeah. Looks like it. The last green job tells us which tests trigger the error:

19:56:27 [py2.7_17.06.2-ce] tests/integration/api_container_test.py::LogsTest::test_logs_streaming_and_follow_and_cancel
19:56:27 [py2.7_17.06.2-ce]   /usr/local/lib/python2.7/site-packages/pytest_timeout.py:178: RemovedInPytest4Warning: MarkInfo objects are deprecated as they contain merged marks which are hard to deal with correctly.
19:56:27 [py2.7_17.06.2-ce]   Please use node.get_closest_marker(name) or node.iter_markers(name).
19:56:27 [py2.7_17.06.2-ce]   Docs: https://docs.pytest.org/en/latest/mark.html#updating-code

[little-dude]

Seems that it's due to pytest-timeout:

    @pytest.mark.timeout(5)
    @pytest.mark.skipif(os.environ.get('DOCKER_HOST', '').startswith('ssh://'),
                        reason='No cancellable streams over SSH')
    def test_attach_stream_and_cancel(self):
        # ...

[little-dude]

Seems like bumping pytest-timeout does the trick. Tests should be passing now.

[shin-]

Thanks!