Fixed _log_console_output call on failure

_log_console_output is defined in tempest.scenario.manager.Manager but
the test class inherited from BaseTestCase that doesn't have it. So
whenever a test failure occurs, we don't log console output, which may
be handy when debugging gate issues.

Change-Id: I48701da8714c9e483401fd1ba987e4f2bef5bd23
Related-Bug: #1742936
diff --git a/barbican_tempest_plugin/tests/scenario/manager.py b/barbican_tempest_plugin/tests/scenario/manager.py
index e7957cb..8a8ca9d 100644
--- a/barbican_tempest_plugin/tests/scenario/manager.py
+++ b/barbican_tempest_plugin/tests/scenario/manager.py
@@ -25,14 +25,14 @@
 from tempest.lib.common.utils import data_utils
 from tempest.lib.common.utils import test_utils
 from tempest.lib import exceptions as lib_exc
-import tempest.test
+from tempest.scenario import manager
 
 CONF = config.CONF
 
 LOG = log.getLogger(__name__)
 
 
-class ScenarioTest(tempest.test.BaseTestCase):
+class ScenarioTest(manager.ScenarioTest):
     """Base class for scenario tests. Uses tempest own clients. """
 
     credentials = ['primary']