test_lb_service_http fails in daemon-containerized-octavia gate

{1} kuryr_tempest_plugin.tests.scenario.test_service.TestLoadBalancerServiceScenario.test_lb_service_http [0.636506s] ... FAILED

Captured pythonlogging:
~~~~~~~~~~~~~~~~~~~~~~~
    2018-08-17 08:18:04,667 29880 INFO [kuryr_tempest_plugin.tests.scenario.test_service] Trying to curl the service IP 172.24.5.15

Captured traceback:
~~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):
      File "/opt/stack/tempest/.tox/tempest/local/lib/python2.7/site-packages/kuryr_tempest_plugin/tests/scenario/test_service.py", line 106, in test_lb_service_http
        self._run_and_assert_fn(curl)
      File "/opt/stack/tempest/.tox/tempest/local/lib/python2.7/site-packages/kuryr_tempest_plugin/tests/scenario/base.py", line 374, in _run_and_assert_fn
        'Got %s.' % cmd_outputs)
      File "/opt/stack/tempest/.tox/tempest/local/lib/python2.7/site-packages/testtools/testcase.py", line 411, in assertEqual
        self.assertThat(observed, matcher, message)
      File "/opt/stack/tempest/.tox/tempest/local/lib/python2.7/site-packages/testtools/testcase.py", line 498, in assertThat
        raise mismatch_error
    testtools.matchers._impl.MismatchError: 2 != 1: Number of exclusive responses is incorrect. Got set(['kuryr-pod-870524709: HELLO! I AM ALIVE!!!\n']).

{3} kuryr_tempest_plugin.tests.scenario.test_service.TestServiceScenario.test_pod_service_curl [29.270233s] ... ok
{3} kuryr_tempest_plugin.tests.scenario.test_service.TestServiceScenario.test_service_curl [0.771603s] ... ok
{3} kuryr_tempest_plugin.tests.test_kuryr_tempest_plugin.TestKuryr_tempest_plugin.test_something [0.001163s] ... ok
{1} kuryr_tempest_plugin.tests.scenario.test_service.TestLoadBalancerServiceScenario.test_unsupported_service_type [145.854409s] ... ok
{1} kuryr_tempest_plugin.tests.scenario.test_service.TestLoadBalancerServiceScenario.test_vm_service_http [75.906855s] ... ok

==============================
Failed 1 tests - output below:
==============================

kuryr_tempest_plugin.tests.scenario.test_service.TestLoadBalancerServiceScenario.test_lb_service_http[id-bddf5441-1244-449d-a175-b5fdcfc2a1a9]
----------------------------------------------------------------------------------------------------------------------------------------------

Captured pythonlogging:
~~~~~~~~~~~~~~~~~~~~~~~
    2018-08-17 08:18:04,667 29880 INFO [kuryr_tempest_plugin.tests.scenario.test_service] Trying to curl the service IP 172.24.5.15

Captured traceback:
~~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):
      File "/opt/stack/tempest/.tox/tempest/local/lib/python2.7/site-packages/kuryr_tempest_plugin/tests/scenario/test_service.py", line 106, in test_lb_service_http
        self._run_and_assert_fn(curl)
      File "/opt/stack/tempest/.tox/tempest/local/lib/python2.7/site-packages/kuryr_tempest_plugin/tests/scenario/base.py", line 374, in _run_and_assert_fn
        'Got %s.' % cmd_outputs)
      File "/opt/stack/tempest/.tox/tempest/local/lib/python2.7/site-packages/testtools/testcase.py", line 411, in assertEqual
        self.assertThat(observed, matcher, message)
      File "/opt/stack/tempest/.tox/tempest/local/lib/python2.7/site-packages/testtools/testcase.py", line 498, in assertThat
        raise mismatch_error
    testtools.matchers._impl.MismatchError: 2 != 1: Number of exclusive responses is incorrect. Got set(['kuryr-pod-870524709: HELLO! I AM ALIVE!!!\n']).

======
Totals
======
Ran: 14 tests in 762.0000 sec.
 - Passed: 9
 - Skipped: 4
 - Expected Fail: 0
 - Unexpected Success: 0
 - Failed: 1
Sum of execute time for each test: 458.6305 sec.