Update Oslo imports to remove namespace package

Change-Id: I4ec9b2a310471e4e07867073e9577731ac34027d
Blueprint: drop-namespace-packages

oslo_concurrency/fixture/lockutils.py

@@ -14,7 +14,7 @@
 #    under the License.
 
 import fixtures
-from oslo.config import fixture as config
+from oslo_config import fixture as config
 
 from oslo_concurrency import lockutils
 

oslo_concurrency/lockutils.py

@@ -27,7 +27,7 @@ import threading
 import time
 import weakref
 
-from oslo.config import cfg
+from oslo_config import cfg
 import retrying
 import six
 

oslo_concurrency/processutils.py

@@ -25,8 +25,8 @@ import shlex
 import signal
 import time
 
-from oslo.utils import importutils
-from oslo.utils import strutils
+from oslo_utils import importutils
+from oslo_utils import strutils
 import six
 
 from oslo_concurrency._i18n import _

oslo_concurrency/tests/unit/test_lockutils.py

@@ -25,15 +25,15 @@ import tempfile
 import threading
 import time
 
-from oslo.config import cfg
+from oslo_config import cfg
 from oslotest import base as test_base
 import six
 
 from concurrent import futures
 
-from oslo.config import fixture as config
 from oslo_concurrency.fixture import lockutils as fixtures
 from oslo_concurrency import lockutils
+from oslo_config import fixture as config
 
 
 class LockTestCase(test_base.BaseTestCase):