Remove python client related logging

The manager.py had several special logging setting for avoiding,
stderr logging when using the nova/cinder python-*client.
Since we are not using these client anymore, this workaround is not
necessary and should be removed.

Change-Id: I7c7594ff45ed7275ebd8c849e118066220f3aafb
diff --git a/tempest/scenario/manager.py b/tempest/scenario/manager.py
index 20b95e4..b49d18b 100644
--- a/tempest/scenario/manager.py
+++ b/tempest/scenario/manager.py
@@ -14,7 +14,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import logging
 import os
 import subprocess
 
@@ -36,13 +35,6 @@
 
 LOG = log.getLogger(__name__)
 
-# NOTE(afazekas): Workaround for the stdout logging
-LOG_nova_client = logging.getLogger('novaclient.client')
-LOG_nova_client.addHandler(log.NullHandler())
-
-LOG_cinder_client = logging.getLogger('cinderclient.client')
-LOG_cinder_client.addHandler(log.NullHandler())
-
 
 class ScenarioTest(tempest.test.BaseTestCase):
     """Base class for scenario tests. Uses tempest own clients. """