Remove unused LOG

This is to remove unused LOG in some files

Change-Id: I4eaf149e2002f30a99730a40a9bd8e4283bdbcb9
diff --git a/tempest/cmd/list_plugins.py b/tempest/cmd/list_plugins.py
index 5f6b3e6..36e45a5 100644
--- a/tempest/cmd/list_plugins.py
+++ b/tempest/cmd/list_plugins.py
@@ -19,13 +19,10 @@
 """
 
 from cliff import command
-from oslo_log import log as logging
 import prettytable
 
 from tempest.test_discover.plugins import TempestTestPluginManager
 
-LOG = logging.getLogger(__name__)
-
 
 class TempestListPlugins(command.Command):
     def take_action(self, parsed_args):
diff --git a/tempest/cmd/run.py b/tempest/cmd/run.py
index e78f6b0..9fe980c 100644
--- a/tempest/cmd/run.py
+++ b/tempest/cmd/run.py
@@ -48,13 +48,11 @@
 
 from cliff import command
 from os_testr import subunit_trace
-from oslo_log import log as logging
 from testrepository.commands import run_argv
 
 from tempest import config
 
 
-LOG = logging.getLogger(__name__)
 CONF = config.CONF
 
 
diff --git a/tempest/cmd/workspace.py b/tempest/cmd/workspace.py
index cc82284..5c55db1 100644
--- a/tempest/cmd/workspace.py
+++ b/tempest/cmd/workspace.py
@@ -53,13 +53,11 @@
 
 from cliff import command
 from oslo_concurrency import lockutils
-from oslo_log import log as logging
 import prettytable
 import yaml
 
 from tempest import config
 
-LOG = logging.getLogger(__name__)
 CONF = config.CONF
 
 
diff --git a/tempest/lib/base.py b/tempest/lib/base.py
index 227ac37..f687343 100644
--- a/tempest/lib/base.py
+++ b/tempest/lib/base.py
@@ -13,14 +13,11 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import logging
 import os
 
 import fixtures
 import testtools
 
-LOG = logging.getLogger(__name__)
-
 
 class BaseTestCase(testtools.testcase.WithAttributes, testtools.TestCase):
     setUpClassCalled = False
diff --git a/tempest/services/volume/base/base_snapshots_client.py b/tempest/services/volume/base/base_snapshots_client.py
index 68503dd..f8cc2fd 100644
--- a/tempest/services/volume/base/base_snapshots_client.py
+++ b/tempest/services/volume/base/base_snapshots_client.py
@@ -10,7 +10,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from oslo_log import log as logging
 from oslo_serialization import jsonutils as json
 from six.moves.urllib import parse as urllib
 
@@ -18,9 +17,6 @@
 from tempest.lib import exceptions as lib_exc
 
 
-LOG = logging.getLogger(__name__)
-
-
 class BaseSnapshotsClient(rest_client.RestClient):
     """Base Client class to send CRUD Volume API requests."""