nova failures with webob 1.7.0: 

nova.tests.unit.api.openstack.compute.test_microversions.MicroversionsTest.test_microversions_inner_function_v21
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Captured traceback:
~~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):
      File "nova/tests/unit/api/openstack/compute/test_microversions.py", line 302, in test_microversions_inner_function_v21
        self._test_microversions_inner_function('2.1', 'controller4_val1')
      File "/usr/lib/python2.7/dist-packages/mock/mock.py", line 1305, in patched
        return func(*args, **keywargs)
      File "nova/tests/unit/api/openstack/compute/test_microversions.py", line 291, in _test_microversions_inner_function
        self.assertEqual(200, res.status_int)
      File "/usr/lib/python2.7/dist-packages/testtools/testcase.py", line 350, in assertEqual
        self.assertThat(observed, matcher, message)
      File "/usr/lib/python2.7/dist-packages/testtools/testcase.py", line 435, in assertThat
        raise mismatch_error
    testtools.matchers._impl.MismatchError: 200 != 400
    

Captured pythonlogging:
~~~~~~~~~~~~~~~~~~~~~~~
    2017-01-18 08:45:09,875 INFO [nova.api.openstack] Loaded extensions: ['test-basic', 'test-microversions']
    

nova.tests.unit.api.openstack.compute.test_microversions.LegacyMicroversionsTest.test_microversions_inner_function_v21
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Captured traceback:
~~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):
      File "nova/tests/unit/api/openstack/compute/test_microversions.py", line 302, in test_microversions_inner_function_v21
        self._test_microversions_inner_function('2.1', 'controller4_val1')
      File "/usr/lib/python2.7/dist-packages/mock/mock.py", line 1305, in patched
        return func(*args, **keywargs)
      File "nova/tests/unit/api/openstack/compute/test_microversions.py", line 291, in _test_microversions_inner_function
        self.assertEqual(200, res.status_int)
      File "/usr/lib/python2.7/dist-packages/testtools/testcase.py", line 350, in assertEqual
        self.assertThat(observed, matcher, message)
      File "/usr/lib/python2.7/dist-packages/testtools/testcase.py", line 435, in assertThat
        raise mismatch_error
    testtools.matchers._impl.MismatchError: 200 != 400
    

Captured pythonlogging:
~~~~~~~~~~~~~~~~~~~~~~~
    2017-01-18 08:45:13,158 INFO [nova.api.openstack] Loaded extensions: ['test-basic', 'test-microversions']
    

nova.tests.unit.api.openstack.compute.test_microversions.MicroversionsTest.test_microversions_inner_function_v22
----------------------------------------------------------------------------------------------------------------

Captured traceback:
~~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):
      File "nova/tests/unit/api/openstack/compute/test_microversions.py", line 299, in test_microversions_inner_function_v22
        self._test_microversions_inner_function('2.2', 'controller4_val2')
      File "/usr/lib/python2.7/dist-packages/mock/mock.py", line 1305, in patched
        return func(*args, **keywargs)
      File "nova/tests/unit/api/openstack/compute/test_microversions.py", line 291, in _test_microversions_inner_function
        self.assertEqual(200, res.status_int)
      File "/usr/lib/python2.7/dist-packages/testtools/testcase.py", line 350, in assertEqual
        self.assertThat(observed, matcher, message)
      File "/usr/lib/python2.7/dist-packages/testtools/testcase.py", line 435, in assertThat
        raise mismatch_error
    testtools.matchers._impl.MismatchError: 200 != 400
    

Captured pythonlogging:
~~~~~~~~~~~~~~~~~~~~~~~
    2017-01-18 08:45:13,842 INFO [nova.api.openstack] Loaded extensions: ['test-basic', 'test-microversions']
    

nova.tests.unit.api.openstack.compute.test_microversions.LegacyMicroversionsTest.test_microversions_inner_function_v22
----------------------------------------------------------------------------------------------------------------------

Captured traceback:
~~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):
      File "nova/tests/unit/api/openstack/compute/test_microversions.py", line 299, in test_microversions_inner_function_v22
        self._test_microversions_inner_function('2.2', 'controller4_val2')
      File "/usr/lib/python2.7/dist-packages/mock/mock.py", line 1305, in patched
        return func(*args, **keywargs)
      File "nova/tests/unit/api/openstack/compute/test_microversions.py", line 291, in _test_microversions_inner_function
        self.assertEqual(200, res.status_int)
      File "/usr/lib/python2.7/dist-packages/testtools/testcase.py", line 350, in assertEqual
        self.assertThat(observed, matcher, message)
      File "/usr/lib/python2.7/dist-packages/testtools/testcase.py", line 435, in assertThat
        raise mismatch_error
    testtools.matchers._impl.MismatchError: 200 != 400
    

Captured pythonlogging:
~~~~~~~~~~~~~~~~~~~~~~~
    2017-01-18 08:45:32,152 INFO [nova.api.openstack] Loaded extensions: ['test-basic', 'test-microversions']