Fix Redis cluster tests running in neutron gate

With the switch to neutron in the gate, the Redis cluster tests were disabled as they failed fairly frequently with the following error:

    2016-11-24 22:58:13.126973 | 2016-11-24 22:58:13.126 | ERROR: proboscis.case.MethodTest (add_initial_cluster_data)
    2016-11-24 22:58:13.128260 | 2016-11-24 22:58:13.127 | ----------------------------------------------------------------------
    2016-11-24 22:58:13.129735 | 2016-11-24 22:58:13.129 | Traceback (most recent call last):
    2016-11-24 22:58:13.131000 | 2016-11-24 22:58:13.130 | File "/usr/local/lib/python2.7/dist-packages/proboscis/case.py", line 296, in testng_method_mistake_capture_func
    2016-11-24 22:58:13.132236 | 2016-11-24 22:58:13.131 | compatability.capture_type_error(s_func)
    2016-11-24 22:58:13.133988 | 2016-11-24 22:58:13.133 | File "/usr/local/lib/python2.7/dist-packages/proboscis/compatability/exceptions_2_6.py", line 27, in capture_type_error
    2016-11-24 22:58:13.135165 | 2016-11-24 22:58:13.134 | func()
    2016-11-24 22:58:13.136470 | 2016-11-24 22:58:13.136 | File "/usr/local/lib/python2.7/dist-packages/proboscis/case.py", line 350, in func
    2016-11-24 22:58:13.137681 | 2016-11-24 22:58:13.137 | func(test_case.state.get_state())
    2016-11-24 22:58:13.139023 | 2016-11-24 22:58:13.138 | File "/opt/stack/new/trove/trove/tests/scenario/groups/cluster_actions_group.py", line 66, in add_initial_cluster_data
    2016-11-24 22:58:13.140312 | 2016-11-24 22:58:13.139 | self.test_runner.run_add_initial_cluster_data()
    2016-11-24 22:58:13.141778 | 2016-11-24 22:58:13.141 | File "/opt/stack/new/trove/trove/tests/scenario/runners/cluster_actions_runners.py", line 180, in run_add_initial_cluster_data
    2016-11-24 22:58:13.143065 | 2016-11-24 22:58:13.142 | self.assert_add_cluster_data(data_type, self.cluster_id)
    2016-11-24 22:58:13.144430 | 2016-11-24 22:58:13.144 | File "/opt/stack/new/trove/trove/tests/scenario/runners/cluster_actions_runners.py", line 187, in assert_add_cluster_data
    2016-11-24 22:58:13.145797 | 2016-11-24 22:58:13.145 | self.test_helper.add_data(data_type, self.extract_ipv4s(cluster.ip)[0])
    2016-11-24 22:58:13.148004 | 2016-11-24 22:58:13.147 | File "/opt/stack/new/trove/trove/tests/scenario/helpers/test_helper.py", line 220, in add_data
    2016-11-24 22:58:13.149252 | 2016-11-24 22:58:13.149 | *args, **kwargs)
    2016-11-24 22:58:13.151050 | 2016-11-24 22:58:13.150 | File "/opt/stack/new/trove/trove/tests/scenario/helpers/test_helper.py", line 265, in _perform_data_action
    2016-11-24 22:58:13.152318 | 2016-11-24 22:58:13.152 | (data_fn_name, self.__class__.__name__, ex))
    2016-11-24 22:58:13.153824 | 2016-11-24 22:58:13.153 | RuntimeError: Error calling add_micro3_data from class RedisHelper - Error calling add_micro3_data from class RedisHelper: CLUSTERDOWN The cluster is down

This will need to be debugged in the gate (probably) and a fix submitted.