Use uuidsentinel from oslo.utils

oslo.utils release 3.37.0 [1] introduced uuidsentinel [2]. This change
rips out nova's uuidsentinel and replaces it with the one from
oslo.utils.

[1] https://review.openstack.org/#/c/599754/
[2] https://review.openstack.org/#/c/594179/

Change-Id: I7f5f08691ca3f73073c66c29dddb996fb2c2b266
Depends-On: https://review.openstack.org/600041

nova/tests/unit/virt/vmwareapi/test_configdrive.py

@@ -15,6 +15,7 @@
 
 import fixtures
 import mock
+from oslo_utils.fixture import uuidsentinel
 
 from nova import context
 from nova.image import glance
@@ -25,7 +26,6 @@ import nova.tests.unit.image.fake
 from nova.tests.unit import utils
 from nova.tests.unit.virt.vmwareapi import fake as vmwareapi_fake
 from nova.tests.unit.virt.vmwareapi import stubs
-from nova.tests import uuidsentinel
 from nova.virt import fake
 from nova.virt.vmwareapi import driver
 from nova.virt.vmwareapi import vm_util

nova/tests/unit/virt/vmwareapi/test_driver_api.py

@@ -25,6 +25,7 @@ import datetime
 from eventlet import greenthread
 import mock
 from oslo_utils import fixture as utils_fixture
+from oslo_utils.fixture import uuidsentinel
 from oslo_utils import units
 from oslo_utils import uuidutils
 from oslo_vmware import exceptions as vexc
@@ -52,7 +53,6 @@ from nova.tests.unit.objects import test_diagnostics
 from nova.tests.unit import utils
 from nova.tests.unit.virt.vmwareapi import fake as vmwareapi_fake
 from nova.tests.unit.virt.vmwareapi import stubs
-from nova.tests import uuidsentinel
 from nova.virt import driver as v_driver
 from nova.virt.vmwareapi import constants
 from nova.virt.vmwareapi import driver
@@ -66,6 +66,7 @@ from nova.virt.vmwareapi import vm_util
 from nova.virt.vmwareapi import vmops
 from nova.virt.vmwareapi import volumeops
 
+
 CONF = nova.conf.CONF
 
 HOST = 'testhostname'

nova/tests/unit/virt/vmwareapi/test_imagecache.py

@@ -17,6 +17,7 @@ import datetime
 import mock
 from oslo_config import cfg
 from oslo_utils import fixture as utils_fixture
+from oslo_utils.fixture import uuidsentinel
 from oslo_vmware.objects import datastore as ds_obj
 from oslo_vmware import vim_util as vutil
 
@@ -24,10 +25,10 @@ from nova import objects
 from nova import test
 from nova.tests.unit import fake_instance
 from nova.tests.unit.virt.vmwareapi import fake
-from nova.tests import uuidsentinel
 from nova.virt.vmwareapi import ds_util
 from nova.virt.vmwareapi import imagecache
 
+
 CONF = cfg.CONF
 
 

nova/tests/unit/virt/vmwareapi/test_images.py

@@ -19,6 +19,7 @@ import os
 import tarfile
 
 import mock
+from oslo_utils.fixture import uuidsentinel
 from oslo_utils import units
 from oslo_vmware import rw_handles
 
@@ -26,7 +27,6 @@ from nova import exception
 from nova import objects
 from nova import test
 import nova.tests.unit.image.fake
-from nova.tests import uuidsentinel
 from nova.virt.vmwareapi import constants
 from nova.virt.vmwareapi import images
 from nova.virt.vmwareapi import vm_util

nova/tests/unit/virt/vmwareapi/test_vmops.py

@@ -17,6 +17,7 @@ import time
 
 import mock
 from oslo_serialization import jsonutils
+from oslo_utils.fixture import uuidsentinel
 from oslo_utils import units
 from oslo_utils import uuidutils
 from oslo_vmware import exceptions as vexc
@@ -35,7 +36,6 @@ from nova.tests.unit import fake_instance
 import nova.tests.unit.image.fake
 from nova.tests.unit.virt.vmwareapi import fake as vmwareapi_fake
 from nova.tests.unit.virt.vmwareapi import stubs
-from nova.tests import uuidsentinel
 from nova import utils
 from nova import version
 from nova.virt import hardware

nova/tests/unit/virt/vmwareapi/test_volumeops.py

@@ -13,6 +13,7 @@
 #    under the License.
 
 import mock
+from oslo_utils.fixture import uuidsentinel
 from oslo_vmware import exceptions as oslo_vmw_exceptions
 from oslo_vmware import vim_util as vutil
 
@@ -25,7 +26,6 @@ from nova.tests.unit import fake_instance
 from nova.tests.unit.image import fake as image_fake
 from nova.tests.unit.virt.vmwareapi import fake as vmwareapi_fake
 from nova.tests.unit.virt.vmwareapi import stubs
-from nova.tests import uuidsentinel
 from nova.virt.vmwareapi import constants
 from nova.virt.vmwareapi import driver
 from nova.virt.vmwareapi import vm_util