vpnaas UT failure

[YAMAMOTO Takashi]

eg. http://logs.openstack.org/87/199387/125/check/openstack-tox-py27/4a583e7/testr_results.html.gz

ft1.6: midonet.neutron.tests.unit.test_extension_vpnaas.VPNTestCaseML2.test_delete_ipsec_site_connection_error_StringException: Traceback (most recent call last):
  File "/home/zuul/src/git.openstack.org/openstack/networking-midonet/.tox/py27/local/lib/python2.7/site-packages/neutron/tests/base.py", line 151, in func
    return f(self, *args, **kwargs)
  File "midonet/neutron/tests/unit/test_extension_vpnaas.py", line 234, in test_delete_ipsec_site_connection_error
    self.test_delete_ipsec_site_connection()
  File "/home/zuul/src/git.openstack.org/openstack/networking-midonet/.tox/py27/local/lib/python2.7/site-packages/neutron/tests/base.py", line 151, in func
    return f(self, *args, **kwargs)
  File "midonet/neutron/tests/unit/test_extension_vpnaas.py", line 229, in test_delete_ipsec_site_connection
    self.assertEqual(204, res.status_int)
  File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
    self.gen.next()
  File "/home/zuul/src/git.openstack.org/openstack/networking-midonet/.tox/py27/local/lib/python2.7/site-packages/neutron_vpnaas/tests/unit/db/vpn/test_vpn_db.py", line 406, in ipsec_site_connection
    'ipsec_site_connection']['id']
  File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
    self.gen.next()
  File "/home/zuul/src/git.openstack.org/openstack/networking-midonet/.tox/py27/local/lib/python2.7/site-packages/neutron_vpnaas/tests/unit/db/vpn/test_vpn_db.py", line 285, in vpnservice
    self._delete('subnets', public_sub['subnet']['id'])
  File "/home/zuul/src/git.openstack.org/openstack/networking-midonet/.tox/py27/local/lib/python2.7/site-packages/neutron/tests/unit/db/test_db_base_plugin_v2.py", line 540, in _delete
    self.assertEqual(expected_code, res.status_int)
  File "/home/zuul/src/git.openstack.org/openstack/networking-midonet/.tox/py27/local/lib/python2.7/site-packages/testtools/testcase.py", line 411, in assertEqual
    self.assertThat(observed, matcher, message)
  File "/home/zuul/src/git.openstack.org/openstack/networking-midonet/.tox/py27/local/lib/python2.7/site-packages/testtools/testcase.py", line 498, in assertThat
    raise mismatch_error
testtools.matchers._impl.MismatchError: 204 != 409

[YAMAMOTO Takashi (yamamoto)]

i guess it will be ok once https://review.openstack.org/#/c/597563/ is merged