[system tests] Test neutron_check_alive_rabbit failed with TypeError: 'set' object does not support indexing

[Tatyanka]

https://product-ci.infra.mirantis.net/view/8.0_swarm/job/8.0.system_test.ubuntu.ha_neutron_destructive/25/testReport/junit/%28root%29/ha_neutron_check_alive_rabbit/ha_neutron_check_alive_rabbit/

Error Message

'set' object does not support indexing

Stacktrace

Traceback (most recent call last):
  File "/usr/lib/python2.7/unittest/case.py", line 331, in run
    testMethod()
  File "/usr/lib/python2.7/unittest/case.py", line 1043, in runTest
    self._testFunc()
  File "/home/jenkins/venv-nailgun-tests-2.9/local/lib/python2.7/site-packages/proboscis/case.py", line 296, in testng_method_mistake_capture_func
    compatability.capture_type_error(s_func)
  File "/home/jenkins/venv-nailgun-tests-2.9/local/lib/python2.7/site-packages/proboscis/compatability/exceptions_2_6.py", line 27, in capture_type_error
    func()
  File "/home/jenkins/venv-nailgun-tests-2.9/local/lib/python2.7/site-packages/proboscis/case.py", line 350, in func
    func(test_case.state.get_state())
  File "/home/jenkins/workspace/8.0.system_test.ubuntu.ha_neutron_destructive/fuelweb_test/helpers/decorators.py", line 80, in wrapper
    result = func(*args, **kwargs)
  File "/home/jenkins/workspace/8.0.system_test.ubuntu.ha_neutron_destructive/fuelweb_test/tests/tests_strength/test_failover.py", line 263, in ha_neutron_check_alive_rabbit
    super(self.__class__, self).check_alive_rabbit_node_not_kicked()
  File "/home/jenkins/workspace/8.0.system_test.ubuntu.ha_neutron_destructive/fuelweb_test/tests/tests_strength/test_failover_base.py", line 902, in check_alive_rabbit_node_not_kicked
    (set(d_ctrls) - set([p_d_ctrl]))[0].name)
TypeError: 'set' object does not support indexing

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/238840

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/238840
Committed: https://git.openstack.org/cgit/openstack/fuel-qa/commit/?id=22a9ee6fcd5448393c3b33e66e044b185663c16a
Submitter: Jenkins
Branch: master

commit 22a9ee6fcd5448393c3b33e66e044b185663c16a
Author: Tatyana Leontovich <email address hidden>
Date: Fri Oct 23 11:43:21 2015 +0300

    Fix type error in neutron_check_alive_rabbit

    Wrap in list condition (set(a) - set(b))
    to get possibility use data access by iondex

    Change-Id: Ie0571349cf686e267cdda76baa680055e0fda681
    Closes-Bug: #1509248