Update redis cluster unit tests for assertRaisesRegexp

[Morgan Jones]

The redis cluster unit tests in trove/tests/unittests/cluster/test_cluster_redis_controller.py should be updated to use assertRaisesRegexp rather than assertRaises to ensure that the correct messages are being generated.

[sandy muñoz (sandrely2611)]

I'd appreciate more specific information about what is being asked in this report. What regexp should be asserted?

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/232126

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/232126
Committed: https://git.openstack.org/cgit/openstack/trove/commit/?id=2eb1902b14161d3957320c6da1064aaba5ef843a
Submitter: Jenkins
Branch: master

commit 2eb1902b14161d3957320c6da1064aaba5ef843a
Author: sandrely26 <email address hidden>
Date: Wed Oct 7 12:16:56 2015 -0500

    Fix redis cluster unit test for assertRaisesRegexp

    The redis cluster unit test was updated to use
    assertRaisesRegexp rather than assertRaises
    to ensure that the correct messages are being generated.

    Closes-Bug: #1491918
    Change-Id: I89f0da62df7933786424ce2e96815765a66625aa

[Thierry Carrez (ttx)]

This issue was fixed in the openstack/trove 5.0.0.0b1 development milestone.